Tube characterization station

ABSTRACT

Systems and methods for use in an in vitro diagnostics setting may include an automation track, a plurality of carriers configured to carry a plurality of sample vessels along the automation track, and a characterization station including a plurality of optical devices. A processor, in communication with the characterization station, can be configured to analyze images to automatically characterize physical attributes related to each carrier and/or sample vessel. A method may include receiving a plurality of images from a plurality of optical devices of a characterization station, wherein the plurality of images comprise images from a plurality of perspectives of a sample vessel being transported by a carrier, automatically analyzing the plurality of images, using a processor, to determine certain characteristics of the sample vessel, and automatically associating the characteristics of the sample vessel with the carrier in a database.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. patent applicationSer. No. 14/773,222 filed Sep. 4, 2015, which is a national phase entryof PCT International Patent Application No. PCT/US2014/021572 filed Mar.7, 2014, which claims priority to, and the benefit of, U.S. ProvisionalApplication No. 61/775,106 filed Mar. 8, 2013, the disclosures of eachof which applications are hereby incorporated herein by reference intheir entirety.

TECHNOLOGY FIELD

The present invention relates in general to an automation system for usein a laboratory environment and, more particularly to systems andmethods for assisting in the transport and interaction with patientsamples for in vitro diagnostics in a clinical analyzer. Embodiments ofthe present invention are particularly well suited, but in no waylimited to, systems and methods for optically characterizing carriersand patient samples or other objects being transported to determine howto further handle samples or objects.

BACKGROUND

In vitro diagnostics (IVD) allows labs to assist in the diagnosis ofdisease based on assays performed on patient fluid samples. IVD includesvarious types of analytical tests and assays related to patientdiagnosis and therapy that can be performed by analysis of a liquidsample taken from a patient's bodily fluids, or abscesses. These assaysare typically conducted with automated clinical chemistry analyzers(analyzers) onto which fluid containers, such as tubes or vialscontaining patient samples have been loaded. The analyzer extracts aliquid sample from sample vessels and combines the sample with variousreagents in special reaction cuvettes or tubes (referred to generally asreaction vessels). In some conventional systems, a modular approach isused for analyzers. A lab automation system can shuttle samples betweenone sample processing module (module) and another module. Modules mayinclude one or more stations, including sample handling stations andtesting stations (e.g., a unit that can specialize in certain types ofassays or can otherwise provide testing services to the larger analyzer,which may include immunoassay (IA) and clinical chemistry (CC) stations.

An automation system for use with analyzers in an IVD environment movestubes containing sample specimens between different stations within ananalyzer or between analyzers. One common way to move these samples isby using passive carriers, such as pucks, along a friction track.Commonly, these automation tracks do not provide a large degree ofprecision when positioning samples. For example, passive pucks may besingulated and positioned mechanically using hard stops within thetrack. Singulation prongs may hold a puck in place once the puck hastraversed the automation track to approximately the needed location.However, these prongs may not be adjustable for each puck andpositioning a puck at a hard stop may not necessarily cause samplescarried by the pucks to be repeatedly positioned relative toinstruments, such as pipettes, along the automation track.

While hard stops may be used to position a puck with relativerepeatability, devices that interact with the sample, such as pipettes,may require precise orientation and positioning of the sample at a givenlocation on the track. The position and orientation of each sample mayvary relative to the hard stops from puck to puck. For example, themanufacturing tolerances between two pucks may prevent a repeatablelocation of the bottom of the tube relative to a given singulationpoint. In addition, tubes may shift within the grasp of a puck, such asby tilting, or moving off center from a holding location within the puckas the puck traverses the automation or at the time an operator placesthe tube into the puck.

One common way to provide somewhat repeatable positioning of a sampletube employs a holder on a puck with self-centering springs. Aself-centering spring mechanism can include three or more springs thatprovide horizontal forces relative to one another to engage the walls ofa sample tube to hold the tube approximately in the center of themechanism. Self-centering springs may be expensive to manufacture withthe tolerances necessary to provide self-centering action. For example,in designs where self-centering springs include multiple springs thatpush relative to one another, the self-centering action requires therelative forces of the springs to be approximately equal. Furthermore,self-centering springs may only be designed to allow tubes with arelative range of sizes that may be narrower than desired.Self-centering springs may also be poorly suited for maintaining theposition of a tube while undergoing large forces as the puck travelsaround an automation track.

Different hospitals or laboratories may also use different size sampletubes. Within the IVD industry, there may be several standard sizes ofavailable sample tubes. Different laboratories may use a variety ofsample tubes or a subset of those available, according to their needsand available inventory. Conventional automation systems have adifficult time using a wide range of available sample tubes. Whileself-centering springs may allow a range of sample tubes to be used, theeffective range of self-centering springs may be limited. In addition,when a range of tubes is used, a typical automation system does not knowwhich size tube is used for each sample. This information can bemanually associated with each sample, but requires additional operatorsteps which may be undesirable.

To determine various properties of samples in sample tubes, varioussensors may be used throughout the IVD environment to allow assessmentof characteristics important to each instrument. This information istypically sensed in an on-demand basis. For example, a pipette mayutilize a liquid level sensor that measures the capacitance or otherelectrical properties of a pipette tip as it is inserted into a liquidsample during aspiration. A robot arm used in a sample handling unit mayinclude tips that are designed to accept a range of tube diameters.These tips may include sensors or feelers to assist the robot arm incapturing a tube without breaking it. A barcode scanner can be placed atdifferent decision points throughout the IVD environment, allowing alaser-based barcode reader to read information about the identity ofeach tube once the tube is stopped and rotated to bring a barcode intoview of the reader. While the stop-and-check approach to barcodescanning can ensure that each sample is appropriately handled at eachdecision point, this process may be slow and result in long queues ateach decision point.

Accordingly, current methods for handling ranges of sample tube typesand for sensing the properties of samples in tubes may be slow orcumbersome, creating a potential bottleneck for increasing throughput ordecreasing turn-around-times of samples that are processed by anautomation system and related instruments.

SUMMARY

Embodiments of the present invention may address and overcome one ormore of the above shortcomings and drawbacks by providing devices andsystems for characterizing physical attributes of carriers and/or thesample vessels being transported by the carriers in an automationsystem. This technology is particularly well-suited for, but by no meanslimited to, transport mechanisms in an automation system for use in anin vitro diagnostics (IVD) environment.

According to one embodiment of the invention, an automation system foruse in an in vitro diagnostics setting includes an automation track, aplurality of carriers configured to carry a plurality of sample vesselsalong the automation track, and a characterization station including aplurality of optical devices. A processor, in communication with thecharacterization station, is configured to analyze images toautomatically characterize at least one physical attribute related toeach carrier.

According to another embodiment of the invention, a characterizationstation is configured for use with an automation system and includes aplurality of optical devices configured to capture one or more images ofa carrier on an automation track a processor configured to analyze theone or more images to determine at least one physical attribute of thecarrier or an object being transported by the carrier. According to oneaspect of some embodiments, the processor can be configured to determinewhich, if any, of a plurality of slots in each carrier is occupied.

According to one aspect of some embodiments, the physical attributesthat can be characterized can include: an orientation of at least onesample vessel relative to each carrier, where the orientation canfurther include at least one of a linear offset or rotational offsetrelative to a nominal position; physical dimensions of at least onesample vessel carried by each carrier; an identification of a type ofsample vessel carried by each carrier; an identification of a type ofeach carrier; an identification of the shape of the bottom of a samplevessel carried by each carrier; a determination of whether a samplevessel carried by each carrier is properly seated; a temperature of asample vessel carried by each carrier; a fluid level or fluid volume ofa fluid contained in a sample vessel carried by each carrier; adetermination of the presence of at least one of the following within ablood sample carried by at least one carrier, a gel barrier, clotting,hemolysis, icterus, and lipemia; an identification whether a cap isplaced on a sample vessel carried by each carrier; an identification ofat least one of a color and a type of the cap; an identification whethera tube-top cup is placed on a sample vessel carried by each carrier; anidentification of a type of the tube-top cup.

According to another aspect of some embodiments, the processor can beconfigured to analyze images to read barcode information encoded on atleast one of a sample vessel, carried by each carrier, and each carrier.

According to yet another aspect of some embodiments, the plurality ofoptical devices of the characterization station can include a pluralityof cameras placed at different positions relative to an imaging locationof each carrier. The plurality of optical devices of thecharacterization station can include at least one camera and one or moremirrors placed in an image plane of the at least one camera to providedifferent perspectives of each carrier. The plurality of optical devicesof the characterization station can also include optics with depths offield substantially concurrent with an expected position of features ofeach carrier. The plurality of optical devices of the characterizationstation include at least one camera configured to view each carrierhorizontally and at least one camera configured to view each carrierfrom above.

According to yet another aspect of some embodiments, the automationtrack can include a linear synchronous motor and the processor isfurther configured to calibrate a position of each carrier within theautomation track.

According to another aspect of some embodiments, each of the carrierscan include a plurality of slots, each configured to receive one of theplurality of sample vessels. The characterization can be configured tomove each carrier so that an occupied slot of the plurality of slots islocated in an image field of the plurality of optical devices prior tocharacterization of the at least one attribute.

According to another embodiment of the invention, a method ofcharacterizing sample carriers in an automation system includes steps ofreceiving a plurality of images from a plurality of optical devices of acharacterization station, wherein the plurality of images compriseimages from a plurality of perspectives of a sample vessel beingtransported by a carrier, and automatically analyzing the plurality ofimages, using a processor, to determine certain characteristics of thesample vessel. The method further includes automatically associating thecharacteristics of the sample vessel with the carrier in a database.

According to one aspect of some embodiments, the method includesutilizing the orientation of the sample vessel to adjust the placementof the carrier at subsequent stations within the automation system.According to another aspect of some embodiments, the method includesdetermining whether the sample vessel occupies a first slot in thecarrier that is located in intersecting image planes of the plurality ofimages and moving the carrier if not. The method may further includedetermining if certain features of the sample vessel are obscured in theplurality of images and repositioning the carrier in response to thedetermination. The method may further include determining if certainfeatures of the sample vessel are obscured in the plurality of imagesand repositioning the sample vessel within the carrier in response tothe determination. According to another aspect of some embodiments, themethod may also include adjusting one of the positions of the carrierrelative to an automation track and the position of the sample vessel ifthe processor determines that the plurality of images containinsufficient information to determine the certain characteristics.

Additional features and advantages of the invention will be madeapparent from the following detailed description of illustrativeembodiments that proceeds with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other aspects of the present invention are bestunderstood from the following detailed description when read inconnection with the accompanying drawings. For the purpose ofillustrating the invention, there is shown in the drawings embodimentsthat are presently preferred, it being understood, however, that theinvention is not limited to the specific instrumentalities disclosed.Included in the drawings are the following Figures:

FIG. 1 is a diagrammatical view of various types of positioningattributes that may be characterized in some embodiments;

FIG. 2 is a diagrammatical view of various types of positioningattributes or errors that may be characterized and corrected with someembodiments;

FIG. 3 is a top and side view of an exemplary carrier for use with someembodiments;

FIG. 4 is a top view and perspective view of an exemplary carrier foruse with some embodiments;

FIG. 5 is a side view of a group of exemplary sample vessel types foruse with some embodiments;

FIG. 6 is a side view of an exemplary sample vessel for use with someembodiments;

FIG. 7 is a top view of an exemplary characterization station for usewith some embodiments;

FIG. 8 is a top view and system diagram of an exemplary characterizationstation for use with some embodiments;

FIG. 9A is a diagrammatic top view of an exemplary characterizationstation for use with some embodiments;

FIG. 9B is a diagrammatic top view of an exemplary characterizationstation for use with some embodiments;

FIG. 10 is a diagrammatic top view of an exemplary characterizationstation for use with some embodiments;

FIG. 11 is a diagrammatic top view of an exemplary characterizationstation for use with some embodiments;

FIG. 12 is a top view of an exemplary clinical chemical analyzergeometry that can be improved by use of the automation systemembodiments disclosed herein;

FIGS. 13A and 13B are diagrammatic views of track geometries that can beused with the automation system embodiments disclosed herein;

FIG. 14 is a diagrammatic view of an exemplary modular trackconfiguration that can be used with the embodiments disclosed herein;

FIG. 15A is a perspective view of an exemplary carrier that can be usedwith the embodiments disclosed herein;

FIG. 15B is a perspective view of an exemplary track configuration thatcan be used with the embodiments disclosed herein;

FIG. 15C is a top view of an exemplary automation system that can beused with the embodiments disclosed herein;

FIG. 16 is a system block diagram of the control systems includingonboard active carriers that can be used with certain embodimentsdisclosed herein;

FIG. 17 is a diagrammatic view of exemplary routes in an exemplary trackconfiguration that can be used for navigation of sample carriers incertain embodiments;

FIG. 18 is a flow chart of an exemplary characterization method for usewith some embodiments;

FIG. 19 is a top view of an exemplary automation track for use with someembodiments;

FIG. 20 is a flow chart of an exemplary characterization and positioningmethod for use with some embodiments; and

FIG. 21 is a top view of an exemplary automation system for use withsome embodiments.

DETAILED DESCRIPTION Terms and Concepts Associated with Some Embodiments

Analyzer: Automated clinical analyzers (“analyzers”) include clinicalchemistry analyzers, automated immunoassay analyzers, or any other typeof in vitro diagnostics (IVD) testing analyzers. Generally, an analyzerperforms a series of automated IVD tests on a plurality of patientsamples. Patient samples may be loaded into an analyzer (manually or viaan automation system), which can then perform one or more immunoassays,chemistry tests, or other observable tests on each sample. The termanalyzer may refer to, but is not limited to, an analyzer that isconfigured as a modular analytical system. A modular analytical systemincludes an integrated and extendable system comprising any combinationsof a plurality of modules (which can include the same type of module ordifferent types of modules) interconnected in a linear or othergeometric configuration by an automation surface, such as an automationtrack. In some embodiments, the automation track may be configured as anintegral conveyance system on which independent carriers are used tomove patient samples and other types of material between the modules.Generally, at least one module in a modular analytical system is ananalyzer module. Modules may be specialized or made redundant to allowhigher throughput of analytical tasks on patient samples.

Analyzer module: An analyzer module is a module within a modularanalyzer that is configured to perform IVD tests, such as immunoassays,chemistry tests, or other observable tests on patient samples.Typically, an analyzer module extracts a liquid sample from a samplevessel and combines the sample with reagents in reaction cuvettes ortubes (referred to generally as reaction vessels). Tests available in ananalyzer module may include, but are not limited to, a subset ofelectrolyte, renal or liver function, metabolic, cardiac, mineral, blooddisorder, drug, immunoassay, or other tests. In some systems, analyzermodules may be specialized or made redundant to allow higher throughput.The functions of an analyzer module may also be performed by standaloneanalyzers that do not utilize a modular approach.

Carrier: A carrier is a transportation unit that can be used to movesample vessels (and, by extension, fluid samples) or other items in anautomation system. In some embodiments, carriers may be simple, liketraditional automation pucks (e.g., passive devices comprising a holderfor engaging a tube or item, a friction surface to allow an externalconveyor belt in the automation track to provide motive force, and aplurality of sides that allow the puck to be guided by walls or rails inthe automation track to allow the track to route a puck to itsdestination). In some embodiments, carriers may include activecomponents, such as processors, motion systems, guidance systems,sensors, and the like. In some embodiments, carriers can include onboardintelligence that allows carriers to be self-guided between points in anautomation system. In some embodiments, carriers can include onboardcomponents that provide motive forces while, in others, motive forcesmay be provided by an automation surface, such as a track. In someembodiments, carriers move along automation tracks that restrict motionto a single direction (e.g., fore and aft) between decision points.Carriers may be specialized to a given payload in an IVD environment,such as having a tube holder to engage and carry a sample tube, or mayinclude mounting surfaces suitable to carry different items around anautomation system. Carriers can be configured to include one or moreslots (e.g., a carrier may hold one or a plurality of sample vessels).

Carriers/Trays/Racks: A carrier may be distinguishable from a tray,which may commonly refer to a device that does not travel along anautomation track (e.g., carried by an operator) and is configured tohold a plurality of payloads (e.g., sample tubes). A rack is a generalterm to describe a device that is configured to hold a plurality ofpayloads (e.g., sample tubes). A rack may refer to a tray (when usedoutside an automation track) or carrier (when configured to traverse anautomation track) that is configured to carry a plurality of payloads.Racks may refer to one-dimensional or two-dimensional arrays of slots,in some embodiments.

Central controller or processor: A central controller/processor (whichmay sometimes be referred to as a central scheduler) is a processor thatis part of the automation system, separate from any processors onboardcarriers. A central controller can facilitate traffic direction,scheduling, and task management for carriers. In some embodiments, acentral controller can communicate with subsystems in the automationsystem and wirelessly communicate with carriers. This may also includesending trajectory or navigational information or instructions tocarriers and determining which carriers should go where and when. Insome embodiments, local processors may be responsible for managingcarriers on local track sections, such as managing local queues. Theselocal processors may act as local equivalents to central controllers.Decision point: Decision points are points on an automation track wheredifferent navigational or trajectory decisions may be made for differentcarriers. A common example includes a fork in a track. One carrier mayproceed without turning, while another may slow down and turn. Decisionpoints may include stopping points at instruments, where some carriersmay stop, while others may proceed. In some embodiments, decelerationzones ahead of turns may act as decision points, allowing carriers thatwill be turning to slow down to limit lateral forces, while others mayproceed if not turning or if the motion profile for that carrier doesnot require slowing down. The decisions made at decision points can bemade by processors onboard carriers, processors local to the tracksection, a central processor, or any combination thereof, depending onthe embodiment.

Independent carrier: In some embodiments, carriers may be characterizedas independently controlled carriers. Independently controlled carriersare carriers with independently controlled trajectories. In someembodiments, independent carriers may be operating at the same time, onthe same track, with carriers carrying one or a plurality ofcombinations of payloads that differ by size, weight, form factor,and/or content. The trajectories of each independently controlledcarrier may be limited by a motion profile that includes; maximum jerk,acceleration, direction, and/or speed for the carrier while moving inthe automation system. The motion profile can limit or define thetrajectory for each carrier independently. In some embodiments, a motionprofile can be different for different sections of the automation system(e.g., in straight track sections vs. around curves to account for theadded lateral forces while turning), for different carrier states (e.g.,an empty carrier may have a different motion profile from a carriertransporting a sample or from a carrier transporting a reagent or otheritem), and/or for different carriers. In some embodiments, carriers caninclude onboard propulsion components that allow individual carriers toindependently operate responsive to a motion profile or trajectory ordestination instructions intended for each separate carrier.

Intelligent carrier/semi-autonomous carriers: In some embodiments,carriers may be characterized as intelligent carriers. An intelligentcarrier is a carrier with onboard circuits that participates in motion,routing, or trajectory decisions. An intelligent carrier can includedigital processors that execute software instructions to proceed alongan automation surface responsive to the instructions or onboard analogcircuits that respond to motion input (e.g., line follower circuits).Instructions may include instructions characterizing motion profiles,traffic, or trajectory rules. Some intelligent carriers may also includeonboard sensors to assist onboard processors to route the carrier ormake decisions responsive to the carrier's environment. Some intelligentcarriers may include onboard components, such as motors or magnets,which allow the carrier to move responsive to control of an onboardprocessor.

In vitro diagnostics (IVD): In vitro diagnostics (IVD) are tests thatcan detect diseases, conditions, infections, metabolic markers, orquantify various constituents of bodily materials/fluids. These testsare performed in laboratory, hospital, physician office, or other healthprofessional settings, outside the body of a patient. IVD testinggenerally utilizes medical devices intended to perform diagnoses fromassays in a test tube or other sample vessel or, more generally, in acontrolled environment outside a living organism. IVD includes testingand diagnosis of disease or quantifying various constituents of bodilymaterials/fluids based on assays performed on patient fluid samples. IVDincludes various types of analytical tests and assays related to patientdiagnosis and therapy that can be performed by analysis of a liquidsample taken from a patient's bodily fluids, or abscesses. These assaysare typically conducted with analyzers into which tubes or vialscontaining patient samples have been loaded. IVD can refer to any subsetof the IVD functionality described herein.

Landmarks: In embodiments where carriers include onboard sensors,optical or other marks in track surfaces or locations viewable/sensiblefrom track surfaces can act as landmarks. Landmarks can conveygeographic information to carriers, such as a current location, upcomingstopping location, decision point, turn, acceleration/decelerationpoints, and the like.

Lab automation system: Lab automation systems include any systems thatcan automatically (e.g., at the request of an operator or software)shuttle sample vessels or other items within a laboratory environment.With respect to analyzers, an automation system may automatically movevessels or other items to, from, amongst, or between stations in ananalyzer. These stations may include, but are not limited to, modulartesting stations (e.g., a unit that can specialize in certain types ofassays or can otherwise provide testing services to the largeranalyzer), sample handling stations, storage stations, or work cells.

Module: A module performs specific task(s) or function(s) within amodular analytical system. Examples of modules may include: apre-analytic module, which prepares a sample for analytic testing,(e.g., a decapper module, which removes a cap on top of a sample testtube); an analyzer module, which extracts a portion of a sample andperforms tests or assays; a post-analytic module, which prepares asample for storage after analytic testing (e.g., a recapper module,which reseals a sample test tube); or a sample handling module. Thefunction of a sample handling module may include managing samplecontainers/vessels for the purposes of inventory management, sorting,moving them onto or off of an automation track (which may include anintegral conveyance system, moving sample containers/vessels onto or offof a separate laboratory automation track, and moving samplecontainers/vessels into or out of trays, racks, carriers, pucks, and/orstorage locations.

Payload: While exemplary carriers are described with respect to carryingpatient samples, in some embodiments, carriers can be used to transportany other reasonable payload across an automation system. This mayinclude fluids, fluid containers, reagents, waste, disposable items,parts, or any other suitable payloads.

Processor: A processor may refer to one or more processors and/orrelated software and processing circuits. This may include single ormulticore processors, single or multiple processors, embedded systems,or distributed processing architectures, as appropriate, forimplementing the recited processing function in each embodiment.

Pullouts, sidecars, offshoot paths: These terms may be used to refer totrack sections that are off the main portion of a track system. Pulloutsor sidecars may include chords, parallel tracks, or other suitable meansfor separating some carriers from a primary traffic pattern. Pullouts orsidecars may be configured to facilitate physical queues or allowcertain carriers to stop or slow down without disrupting traffic on amain track section.

Samples: Samples refer to fluid or other samples taken from a patient(human or animal) and may include blood, urine, hematocrit, amnioticfluid, or any other fluid suitable for performing assays or tests upon.Samples may sometimes refer to calibration fluids or other fluids usedto assist an analyzer in processing other patient samples.

STAT (short turnaround time) sample: Samples may have different priorityassigned by a laboratory information system (LIS) or operator to assignSTAT priority to samples that should take precedent over non-STATsamples in the analyzer. When used judiciously, this may allow certainsamples to move through the testing process faster than other samples,allowing physicians or other practitioners to receive testing resultsquickly.

Station: A station includes a portion of a module that performs aspecific task within a module. For example, the pipetting stationassociated with an analyzer module may be used to pipette sample fluidout of sample containers/vessels being carried by carriers on anintegrated conveyance system or a laboratory automation system. Eachmodule can include one or more stations that add functionality to amodule.

Station/module: A station includes a portion of an analyzer thatperforms a specific task within an analyzer. For example, acapper/decapper station may remove and replace caps from sample vessels;a testing station can extract a portion of a sample and perform tests orassays; a sample handling station can manage sample vessels, moving themonto or off of an automation track, and moving sample vessels into orout of storage locations or trays. Stations may be modular, allowingstations to be added to a larger analyzer. Each module can include oneor more stations that add functionality to an analyzer, which may becomprised of one or more modules. In some embodiments, modules mayinclude portions of, or be separate from, an automation system that maylink a plurality of modules and/or stations. Stations may include one ormore instruments for performing a specific task (e.g., a pipette is aninstrument that may be used at an immunoassay station to interact withsamples on an automation track). Except where noted otherwise, theconcepts of module and station may be referred to interchangeably.

Tubes/sample vessels/fluid containers: Samples may be carried invessels, such as test tubes or other suitable vessels, to allow carriersto transport samples without contaminating the carrier surfaces.

Exemplary Embodiments

Embodiments of the present invention may overcome some of theshortcomings of the prior art by providing a common optical instrumentsuitable for characterizing the physical attributes of each carrier andsample tube being carried by that carrier. A characterization stationmay be placed in a suitable location in an automation system, allowing asingle characterization of a sample vessel and its carrier. The identityand attributes of the sample vessel or combination of sample vessel andcarrier can be associated with the patient sample in a local database.This information about the physical attributes of the sample vessel canbe used in each processing station throughout the automation system toquickly determine how the processing station should interact with thepatient sample, without requiring accurate sensors to be used at eachprocessing station.

A characterization station can include a plurality of optical devices,such as cameras or mirrors. Cameras can include visible light, IR, or UVlight cameras, and can be used in conjunction with appropriate lightingsources. In some embodiments, mirrors are also used to allow additionalinformation to be captured in a single image, allowing fewer cameras tobe used. Optical devices can be placed in different locations within thecharacterization station to allow different perspectives to be capturedin different images. This may allow a substantially 360° view to becompiled for each sample vessel or carrier. In some embodiments, acamera can also be placed facing downward to provide an overhead view ofeach sample vessel. The images captured can then be analyzed using animage processor, which may include a CPU or DSP. The image processor canidentify salient features within the images to evaluate the identity ofeach sample vessel or carrier, as well as characterize certain physicalattributes of each sample vessel. These attributes may include, forexample, the height and diameter of the tube, whether the tube currentlyhas a cap, the color or other identifying characteristics of the cap,which may convey the type of sample, whether a tube-top cup is placed inthe sample vessel and the type of tube-top cup used, the orientation ofthe sample vessel relative to the carrier (which may include the tilt,height, and/or X-Y translation of the vessel relative to the carrier, orany combination thereof), and the height of any liquid in the samplevessel. Other attributes of sample vessels or carriers that can bedetermined from optical sensors and images processed are discussedthroughout. The image processor may also look for identifying marks inthe images, including barcode information. The image processor mayanalyze barcode information to identify the sample and associate thephysical attributes determined during image analysis with that sample.

By associating the physical attributes of each sample vessel with theidentity of the sample, when subsequent stations process that sample,the stations may have access to the recorded physical attributes of thesample vessel and utilize this information during sample processing,without requiring additional sensors at each processing station. Forexample, the orientation of each sample relative to each carrier can beused by subsequent processing stations to identify an exact location ofthe center of each sample vessel before a carrier arrives at thatprocessing station. This may allow a processing station to make a slightadjustment to the position of the carrier relative to the position ofinstruments, such as pipettes, that interact with the sample to allowsuccessful interaction with non-centered samples. In some embodiments,this may eliminate the need for self-centering springs, allowing cheaperor more robust sample holders to be used with each carrier.

In some embodiments, carriers may be provided that do not rely on hardsingulation stops to come to rest at a desired stopping location.Carriers may further include the ability to precisely stop at a desiredoffset from an absolute stopping location, allowing a sample tube to bepositioned independently of a hard stop. By characterizing the locationof the sample relative to a carrier and positioning a carrier relativeto an offset calculated from this characterization, a sample tube may beprecisely and reliably positioned relative to instruments, such aspipettes, that may require reliable positioning of samples prior tooperation. Furthermore, in some embodiments, a wide range of tube sizesmay be used, and an offset may be used to reliably position the centerof each sample tube relative to an instrument.

In the prior art, hard stops were used to determine the stoppinglocation of a carrier, such as a puck. However, the position andorientation of sample tubes may vary between carriers relative to theposition of the hard stop. As a result, the resting position orientationof a sample tube may vary from a nominal position. There are threeprimary ways in which the position and orientation of a sample tube mayvary from a nominal position as shown in FIG. 1. FIG. 1 shows therelative position of a line of action to the walls of the sample tube. Aline of action can be considered the path that a probe tip will takewhen interacting with a tube. A line of action may be represented bycrosshairs (such as line of action 2) when viewing the horizontal planein a top-down fashion or as a vertical line (such as line of action 10)when viewing of the line of action from the side. Positioning errors canbe considered a deviation of the center of a tube relative to the lineof action of an instrument in the horizontal plane, while tilt errorscan be considered deviations of the center of a tube relative to theline of action from the side.

Tube 4 shows an ideal position (i.e. nominal) where the center of tube 4coincides with the line of action 2. Tube 4 travels in a direction 3,along an automation track. In this example, tube 4 has come to rest at anominal position. Tube 6, however, is positioned with an error in thelateral direction from the nominal position of the line of action 2.Tube 8 is positioned with an error in the longitudinal direction (i.e.,along the direction of travel 3) relative to the nominal position wherethe center of tube 8 would be coincident with line of action 2. Tubes 6and 8 illustrate X and Y positional errors. Tubes may also be describedas sample vessels, as some embodiments can work with various shapedsample vessels that may be used to transport samples in an IVDenvironment.

Tube 12 shows the ideal, nominal tilt of a tube relative to the line ofaction 10. Here, tube 12 is positioned in the nominal verticaldirection. Tube 14 has a tilt error relative to the line of action 10,illustrating an extreme angle of tilt that may be experienced by a tubethat is positioned at an instrument in an automation system. Thepositional errors of tubes 6 and 8 and the tilt error of tube 14 are notideal and may make it difficult to operate an instrument. For example, apipette may clip the wall of the sample tube interfering with itsoperation. Furthermore, if smaller tubes are used, it may be difficultor impossible for that tube to interact with an instrument due to theposition or tilt errors illustrated in FIG. 1.

FIG. 2 illustrates the effect of using hard stops to position centers oftubes relative to lines of action. Hard stops 16 stop carrier 17 alongan automation track at a predetermined location. Carrier 17 carries atube, such as tube 18. Tube 18 illustrates a nominal position for thecenter of the tube relative to line of action 10, which may be the lineof action of a pipette at a testing station. Tube 20, however, reveals apotential issue using hard stops 16 to stop a carrier at the base of thecarrier 17. Center line 22 at the center of tube 20 is tilted relativeto line of action 10. Therefore, tube 20 has a tilt error relative tonominal.

Hard stops 24 illustrate another potential issue using hard stops toposition the stopping point of a tube. Engaging a tube using hard stopsmay also damage or jar a tube and may be problematic for any number ofreasons other than introducing positional errors, such as riskingtipping a carrier over, which may cause the contents of a sample tube tospill. Tube 26 engages hard stops 24 at a nominal position andorientation. The center of tube 26 is coincident with line of action 10.However, tube 28 comes to rest at a tilt relative to line of action 10.In some instances, tube 28 may be knocked into a tilted orientation dueto the force used to stop the tube by hard stops 24. Center line 22 hasa tilt error relative to the nominal position.

Tubes 34 and 36 illustrate how tubes may come to rest with a positionalerror relative to nominal that may be introduced by any number ofcauses. For example, the best line of action available for tube 34,which may be centerline 30, may deviate from the line of action 10 of aninstrument by an offset 32. This offset 32 is a positional error. Inthis instance, a pipette operating along the line of action 10 willcompletely miss the contents of sample tube 34. Offset 32 may beintroduced because carrier 17 stopped too soon, or because tube 34 isoff center from the center of carrier 17. For example, carrier 17 mayinclude a holding mechanism that is designed to operate with a pluralityof different sizes of tubes. Larger tubes may result in a differentlocation of the center of the tube compared to the center of a smallertube. It should be appreciated that for smaller diameter tubes thelikelihood that an offset 32 will be outside the diameter of the tube isincreased. Accordingly, if smaller tubes or tube-top cups are used, themargin of error for offset 32 may be reduced proportionally.

Tube 36 has a positional error as indicated by offset 32 between thenominal line of action 10 (e.g., the nominal resting position of tube36) of an instrument and the nominal line of action 38 for tube 36. Itshould be noted that tube 36 also has a tilt error as indicated betweenthe center line 22 and the nominal line of action for the tube, line 38.Line 38 indicates that a pipette could still be inserted into tube 36 toreach fluids contained in the tube, even though a tilt has beenintroduced. While this tilt may not be ideal because the range positionsthat can be used for a line of action into the tube is limited, in someembodiments, the offset 32 can still be used to position the line ofaction of a pipette at a viable line of action within the tube byremoving the offset.

FIG. 3 shows an exemplary embodiment of the tube carrier portion of acarrier that may be suitable for reducing tilt errors in the positioningof a tube. Tube 42 includes a centerline 40. Tube 42 is carried bycarrier 41, which includes a V-shaped block 44 that allows tube 42 to beself-centered in the lateral direction when held in place by a force inthe longitudinal direction, which may be provided by a spring, such asleaf spring 46. Tine 47 may support leaf spring 46. Because of theV-shaped block 44, regardless of the diameter of tube 42, a force in thelongitudinal direction can force the tube into the recess of theV-shaped block and orient the tube vertically at the lateral centerpoint of the recess. Such a design can utilize a single spring 46 whichmay be a single strong spring which may hold tube 42 into block 44 withsufficient force that carrier 41 may undergo any reasonably desiredrange of acceleration while traversing the automation track withoutmovement of tube 42. Furthermore, because only a single spring needprovide a force, the tolerance needed in producing and selecting thespring may be very low. In contrast, many self-centering spring designsrequire various springs to provide competing forces, such that thesprings must be tightly toleranced to provide balanced spring forces toensure that the tubes are held in the center. In a carrier 41, spring 46works with block 44 to reliably center tube 42 in the lateral direction,but not necessarily in the longitudinal direction. Larger or smallertubes may sit in block 44 with a center that moves fore or aft relativeto carrier 41 when carrier 41 is oriented in a direction of travel 48.

Block 44 includes a V-shaped channel that is oriented in a verticaldirection, forming a vertical spine. Because tubes generally havesubstantially parallel walls, a force pushing the tube into thisV-shaped spine will generally orient the centerline of the two parallelwalls to the orientation of the spine, as this is the lowest energystate and resting place of the tube within the V-shape. In this manner,block 44 may provide advantages over traditional self-centering springdesigns. First, a sufficiently large force will keep tube 44 oriented ina substantially vertical direction, therefore minimizing or eliminatingtilt errors in the orientation of the tube. Furthermore, even with apoorly toleranced spring 46, tube 44 will be substantially oriented atthe center of block 44 in the lateral direction. Accordingly, carrier 41need only be moved to a proper location in direction 48 to position tube42 in substantially the nominal location for a line of action of a giveninstrument within an automation system.

Block 44 may be replaced with two tines 43 and 45 that provide aV-shaped recess into which a tube may be placed, while allowing thebackside of the tube to be viewed. For example, the gap between tines 43and 45 may allow viewing of any barcode information on tube 42. The gapbetween tines 43 and 47 and between tines 45 and 47 may also allowreading of any barcode information viewable on the sides of tube 42.

A larger tube 50 may also be placed between lines 43, 45, and 47. As canbe seen in FIG. 3, the centerline 52 is moved in a fore directionrelative to centerline 40 of tube 42. This is because the largerdiameter of tube 50 causes tube 50 to sit further forward in the V-shapeof tines 43 and 45 and because the larger diameter causes the centerlineto sit further from the points of contact with tines 43 and 45. Spring46 is more compressed when holding larger tube 50. While centerline 52is moved forward from centerline 40 by a distance 54 due to thedifference in sizes of the tubes, it should be appreciated that bothtube 42 and tube 50 are both oriented substantially parallel to tines 43and 45 and centered in the lateral direction between tines 43 and 45.Accordingly, the distance 54 between the centerlines can be corrected byusing a different offset when positioning carrier 41 at an instrumentalong the automation system to align the centerline of each instrumentwith the centerline of each tube.

FIG. 4 shows a top view and a perspective view of an exemplary carrierfor use with some embodiments of the present invention. Carrier 55 is adual slot carrier, allowing single samples to be carried in either oftwo slots. In some embodiments, multiple samples may be simultaneouslycarried. Multiple slot carriers are described in further detail in U.S.provisional patent application 13/64,620, filed Oct. 11, 2013, which isincorporated herein in its entirety. A sample vessel 56 may include asample tube that carries a patient sample or other fluid. Sample vessel56 may be held in place by springs 58, which provide a common springforce to press sample tube 56 into vertical tines 59. Tines 59 act as aV-block, allowing tube 56 to be oriented securely in a verticaldirection. Meanwhile, slot 60 may remain unoccupied.

Carrier 55 may assist the automation system by providing a secure,repeatable orientation and position of tube 56 relative to thestructures of carrier 55. By detecting the orientation of tube 56 withrespect to carrier 55, subsequent processing stations can utilize anoffset to position carrier 55 and a location that allows instruments tointeract with sample vessel 56. This orientation may be detected byimage analysis performed by a processor coupled to the characterizationstation.

A characterization station may analyze images of tubes in carriers, suchas carrier 55, to determine various physical properties of the carrierand sample vessels being carried. For example, the orientation of asample vessel within the carrier, including the relative position of thesample vessel to the carrier can be characterized through opticalanalysis. Similarly, physical dimensions of the sample vessels beingcarried can also be characterized. Whether these sample vessels includecaps or tube-top cups may also be determined using the characterizationstation. The height of fluid contained in the vessels may also beoptically characterized. In addition, barcodes on the sides of samplevessels can be read by providing various perspectives to allow thebarcode information to be optically read without requiring that the tubebe rotated or otherwise carefully placed in a given orientation by anoperator.

Sample vessels used with carrier 55 may include a range of differentsizes of sample tubes. FIG. 5 illustrates some exemplary tubeconfigurations that may be used with the sample carrier. A range ofsample tubes 61 may be inserted into slots of carrier 55. Some tubes maybe short, while others may be tall. Some tubes may be narrow, while sometubes may be wide. Furthermore, some tubes may include a cap 62, whichrequires removal prior to subsequent processing. When a characterizationstation detects the presence of a cap 62, the characterization stationmay inform the automation system that the sample carrier must be routedto a de-capping station prior to subsequent processing. The color orpattern of the cap may also be identified optically. In someembodiments, the cap color or pattern may indicate the type of samplebeing transported (e.g., whole blood, urine, possibly infected, etc.) Insome embodiments, the characterization station can identify the pattern,color, and/or type of cap on a sample vessel to identify the type ofsample being carried.

Some tubes may also include a tube-top cup 63. By performing imageanalysis at the characterization station, the presence of a tube-top cupmay be noted in the image, allowing that tube to be identified as havinga tube-top cup. In some embodiments, the characterization station canidentify the size/type or position of the tube-top cup to furtheridentify the center and positional tolerances needed when a pipetteinteracts with the tube-top cup. Subsequent processing stations mayutilize this information to change how they interact with the samplestored in tube-top cup 63. A tube-top cup can be a narrow, substantiallyshallower vessel that fits into the top of a larger sample tube,allowing smaller amounts of sample liquid to be stored in a vessel witha suitable aspect ratio for interacting with a pipette. When acharacterization station notes the presence of tube-top cup 63, itslocation within the sample vessel can be noted and used to accuratelyposition the tube-top cup at subsequent processing stations. A tube-topcup may be substantially less than 1 cm in diameter, and may requireadditional precision in locating the center of the tube-top cup wheninteracting with subsequent processing stations. The presence of atube-top cup may also necessitate special handling of a carrier as ittraverses the automation track, such as requiring lower cornering speedsof a carrier transporting a sample in a tube-top cup.

In some embodiments, a processor that analyzes images associated withsample vessels at the characterization station may compare the detectedphysical dimensions to a known set of available sample vessels, allowingthe processor to select the type of sample vessel in the image. Bylimiting the available dimensions to a smaller set of discrete availabledimensions, image analysis at characterization station may be improved.This may allow the characterization station to accurately identify whichtype of tube in set 61 to which the tube currently being characterizedbelongs.

FIG. 6 shows an exemplary sample tube 65 with a sample fluid having aheight 66. Optical devices in the characterization station can identifydifferent coloration between the material of the sample tube 65 and thesample fluid or a meniscus line to identify the sample fluid height 66during image analysis.

FIG. 7 shows an exemplary characterization station that may be used tocharacterize offsets needed to position a tube at an optimal position onan automation track. The characterization station can include aplurality of optical devices 67 (only one shown for illustrativepurposes) that capture images that may be analyzed by a processor tomeasure the distances between tubes and carriers relative to some knownor expected position on the carrier. The optical measuring devices 67can include any suitable optical devices, such as a camera withsufficient resolution and accuracy to characterize distances in an image(such as by mapping pixel distances relative to known distances in thereal world). Other optical devices can include mirrors to allow a camerato view the tube from different perspectives (as explained below).Optical devices 67 generally include a plurality of imaging devicessuitable for providing a plurality of perspective images of the carrierand sample vessels being carried thereon.

Optical device 67 can characterize carrier 55 and a tube 56 beingcarried by carrier 55. Carrier 55 travels along automation track 68,which may be any suitable automation track known in the art or disclosedherein. An individual optical device 67 can provide an image sufficientfor measuring distances or reading barcodes within field of view 69.

In some embodiments, in addition to optical devices 67, additionalsensors can be used in the characterization station. For example, ameasuring device may project an infrared beam onto an object, allowingaccurate measurements of the relative distances within the field ofview. In some embodiments, a measuring device may include IRrangefinders or projection devices along with mono or stereoscopiccameras. This may allow the characterization station to measuredistances in one dimension, two dimensions, or three dimensions. In someembodiments, a raster scan or a single slice of a scan can be used tomeasure a single distance of a tube surface relative to a nominalposition along the direction of travel. In some embodiments, one or moreLEDs on one side of automation track 68 and an electro-optical device,such as a camera or one or more photo detectors on the other side of thetrack can provide precise timing-based measurement of shapes anddistances between portions of objects passing along the track. Forexample, precise timing when the fore and aft portions of a carrier passa characterization station, and when the fore and aft portions of a tubepass the characterization station, can provide precise information aboutthe relative location of the tube within the carrier. In someembodiments, an overhead camera may be used, which may provide atwo-dimensional image and allow for a two-dimensional, X-Y measurementof the position and orientation of a tube relative to a carrier.

In some embodiments, a light source may be used in conjunction with oneor more cameras to allow illumination of tubes and carriers or toprovide distinguishable colors or patterns that may be used to provideadditional detail to an image. For example, an IR light source can beused with an IR camera to provide detail in an image that may not beotherwise available from ambient light. In some embodiments, amonochrome grid may be projected to assist in viewing depth in an image.Furthermore, in some embodiments, the IR beam and an IR camera can beused in conjunction with another visible-light camera (that may beoffset from the IR camera) to provide color and range information.

In addition, the light source may be offset from the viewing camera,which may allow distance information to also be gathered from the imagein some embodiments, the optical system used may be similar to thesystem used by the Xbox Kinect vision system available from MicrosoftCorporation. In some embodiments, three-dimensional information isgathered by the use of a plurality of cameras and/or a plurality oflight sources.

In some embodiments, multiple cameras may be used to provide two orthree dimensional information of the position orientation of the tubewithin a carrier, as well as providing more image details for a morerobust measurement of offsets of the tube from a nominal position.

By analyzing, via a processor, images from optical device 67, thecharacterization station can measure a distance 71 between the observedcenterline 70 of tube 56 and the expected centerline 72, which maycoincide with the centerline or a known position relative to carrier 55.In some embodiments, a single carrier carries a single tube at thegeometric center of the carrier in the longitudinal direction undernominal conditions. Observing a distance 71 between the actualcenterline of a tube and the expected centerline of the tube mayidentify an offset that should be applied to carrier 55 when carryingtube 56 for each station the carrier visits. The next time a tube isinserted into carrier 55, a new offset 71 can be determined duringanother characterization. In some embodiments, a carrier/tubecombination is characterized at least once for each tube that isinserted into a carrier. In some embodiments, a tube and carriercombination may be characterized multiple times as it traverses anautomation system.

The term characterization station, as used herein, is any combination ofcomponents in the automation system that optically characterizes acarrier and/or a sample vessel being characterized. The opticalcharacterization can include characterization of physical attributes,such as the dimensions of a carrier or sample tube, an identification ofthe type and status of a sample tube (e.g., capped, uncapped, having atube-top cup, etc.), a characterization of the orientation of the samplevessel (which may include x-y-z location, tilt, etc.), a calibration ofthe orientation of the distances between a position of a tube, such asthe tube's centerline, relative to other positions within the automationsystem, such as the leading edge of a carrier or a part of the carrierthat is used to provide a reference position. In some embodiments, thecharacterization station can observe an orientation of a carrier orsample vessel/payload within a carrier where the orientation informationincludes at least one of a linear offset (e.g., X, Y, and/or Ztranslation offset) and a rotational (e.g., tilt, yaw, and/or roll)relative to a nominal position. The optical characterization can includeoptical identification of a sample tube or carrier by reading opticalmarks in images of the carrier or sample vessel.

In some embodiments, carriers can include optical marks, such as opaqueor reflective marks or patterns, physical surfaces, such as leadingedges or indentations, magnetic devices, or any other identifiablepoints on a carrier that may be used for reference points in a distancemeasurement. In some embodiments these include barcodes or 2-D digitalmarks, such as QR codes (such as QR code 57 shown in FIG. 4). In someembodiments, characterization stations perform measurements of tubesrelative to reference points on a carrier using optical means, such ascameras or other optical devices disclosed herein. In some embodiments,optical devices can include a plurality of cameras or a camera with aplurality of mirrors that allow the camera to view a vessel from aplurality of perspectives to provide multiple images in a single image.In some embodiments, characterization stations may observe andcharacterize carriers and tubes using other means, such as magneticmeasurement or physical measurement, such as providing feelers to notethe distances between surfaces of a tube and a carrier. In someembodiments, radiation devices, such as x-ray or tomography devices, maybe used to measure positions of tubes and surfaces of carriers tocharacterize carriers and/or combinations of carriers and tubes.

In some embodiments, imaging devices can be used in a characterizationstation to determine certain extrinsic or intrinsic properties of fluidsamples contained in sample vessels. For example, an imaging device cancapture an image that, when processed, reveals a level of the fluidsample. This may be useful for determining when a fluid level is gettinglow. Analyzer stations typically have subsystems to detect the fluidlevel in a tube. By bringing this capability to a central sensingdevice, the cost can be reduced and reliability increased (e.g., byusing one high quality sensor instead of many—one per analyzerstation—low quality sensors). In some embodiments, the characterizationstation can utilize the fluid level determined from an image, along withinformation about the type of sample to being observed (which may bedetermined optically or from the database based on a sample or carrieridentification) to determine a sample volume. Using a combination offluid level and the size and type of the sample vessel, a sample volumeif can be readily calculated. In the prior art, analyzers generally donot detect insufficient sample volume until they attempt to aspiratefluid for a test and discover that there is not enough (usually bydetecting that they have aspirated air). By detecting insufficientsample volume as soon as the sample is imaged at the characterizationstation, it is possible to notify the lab that another vessel of apatient's bodily fluid will be needed much earlier. This earlynotification can make a critical difference in patient care and may makeit easier for the lab or hospital to manage errors.

In some embodiments, imaging devices in a characterization station candetermine the shape of the bottom of a tube. This information can beused by sample handling robots to provide special handling to difficultshaped tubes. For example, a rounded-bottom tube can be inserted into aslot with a slight lean as long as the slot has a chamfer. The chamferwill convert the downward force into a lateral correcting force due tothe rounded shape. With flat-bottom tubes, the correcting effect of achamfer will not be realized. Therefore, flat bottom tubes may requireadditional placement efforts before declaring seating properly to avoida fatal processing error. The shape of the bottom can also be used todetermine fluid volume when the size of the tube and fluid level aredetermined.

In some embodiments, imaging devices in a characterization station canvisually confirm that a sample vessel has been fully seated on thebottom of a carrier. This may be important if tubes can be manuallyplaced onto carriers by operators, because this greatly increases thechance that a tube will not be properly seated. Improperly seated tubescan experience unsafe forces moving around an automation system and maylean, fall over, or be ejected. A leaning tube may cause a pipette orrobotic arm to jam. An improperly seated tube could also cause errors intube height measurement or sample volume determination.

In some embodiments, IR sensitive optics can be used to detect thetemperature of a sample vessel and/or the fluid within the vessel. Thisinformation can be used by analyzers to adjust calibration curves toaccount for shift in temperature from nominal temperature. This may beuseful because chemical reactions may occur at different speeds atdifferent temperatures. By identifying the temperature of the samplevessel at a characterization station, lower cost sensors in analyzersmay be used, because the analyzer may not need to perform thetemperature measurement for each reaction.

In some embodiments, multiple types of carriers can be used within theautomation system. For example, some carriers may include a single slotfor a sample, some may include multiple slots, some may carry reagentpacks, or some may be configured to perform maintenance tasks. In someembodiments, the characterization station may visually inspect eachcarrier to determine salient features that can allow a processor torecognize the type of carrier being characterized.

In some embodiments, the characterization station can determineproperties or errors in blood samples. For example, images can beprocessed to determine the presence of gel barriers between serum andthe rest of the blood in centrifuged samples. Serum is often extractedfrom whole blood through centrifugation. Tubes that need to becentrifuged often contain a gel at the bottom which has a lower densitythan red blood cells and a higher density than serum. The forcesexperienced inside of a centrifuge cause the gel to reflow above the redblood cells and below the serum, forming a barrier that keeps the serumand red bloods cells separated for a period of time long enough toperform testing. It is desirable that pipette not puncture the gelbarrier because it could cause red blood cells to pour back into theserum, polluting the sample and generating an invalid test result. Thiscan also clog up the pipette. In some embodiments, the characterizationstation can help prevent this error from occurring by detecting thelevel of the gel barrier inside of the tube and reporting it to theanalyzer stations.

In some embodiments, the characterization station can be used tooptically detect errors in blood samples. For example, blood clots in asample vessel may be optically detected. In the prior art, blood clotsare detected by an analyzer when it attempts to aspirate a patientsample for a test and the pipette becomes obstructed. This can clog upthe pipette causing the analyzer to go offline and require cleaning ormaintenance. This can cause delays, because the lab may need to manuallyfilter the sample or get a new vial of a patient's bodily fluid. Thisearly notification could make a critical difference in patient care andmay make it easier for the lab or hospital to manage errors.

In some embodiments, the characterization station can be used tooptically detect hemolysis, icterus, and lipemia (HIL) in a samplevessel. In the prior art, HIL are detected by an analyzer when itattempts to aspirate a patient sample for a test. A sample with HILcannot be processed, causing a delay in test results for that sample,because the lab needs to get a new vial of a patient's bodily fluid.This early notification can make a critical difference in patient careand certainly makes it easier for the lab/hospital to manage errors.Clots and HIL may be detected optically by observing anomalies in imagesof blood samples, such as discoloration, milky qualities, orheterogeneous densities.

FIG. 8 shows an exemplary overhead view of a characterization stationfor use with some embodiments. A plurality of imaging devices, in thisexample, cameras 67A, 67B, and 67C, are positioned to provide variousperspectives of a carrier 55 on an automation track 68. In this example,camera 67A provides a lateral view of a carrier 55 while cameras 67B and67C provide oblique views of the fore and aft portions of carrier 55.Carrier 55 may move along automation track 68 to the position shown inFIG. 8. Cameras 67A-67C will capture images of the carrier. These imagesmay be transmitted to CPU 74 and memory 76. CPU 74 may act as an imageprocessor to analyze the images captured by the imaging devices toidentify salient features, such as structural elements of the carrierand a sample vessel. Salient features may include sidewalls of a samplevessel, tines of a carrier that hold the sample vessel, the top edge ofthe sample vessel, a cap placed on the sample vessel, a tube-top cupbased in the sample vessel, a barcode placed on the side of a carrier orsample vessel, a meniscus in a sample vessel indicating the top of asample, etc. CPU 74 may determine the physical attributes of carrier 55and any sample vessels carried thereon and the identity of the samplevessel or carrier. The identity of the sample vessel or carrier can beassociated with the physical attributes that are determined from theimage. This association can be stored in memory 76 for access by otherportions of the automation system. For example, a sample's barcodeidentity may be associated with the height and width of the samplevessel, as well as the state of the sample, including whether it has acap or tube-top cup, the height of any fluid sample contained, thelongitudinal or lateral offset of the sample vessel relative tostructures in the carrier, etc. This information may be used forprecisely positioning a carrier when interacting with each sample vesselat subsequent processing stations within the automation system.

The association of physical attributes with the sample vessel may alsobe useful in routing the sample vessel within the automation system. Forexample, reading a barcode placed on a sample vessel can create anassociation between each carrier and that sample vessel, allowing thecarrier to be directed to destinations intended for the sample vessel.Similarly, where a sample has yet to be de-capped, the association ofthe sample with a sample vessel having a cap can cause the automationsystem to update the destination of the sample to a de-capper beforesending the sample to other locations, such as testing stations.

By associating attributes determined from images with each sample vesselor carrier in memory 76, a single characterization station can be usedfor the entire automation system. This can allow a central location forcharacterizing all important attributes of a sample vessel. This mayallow significant cost savings and performance advantages over someprior art approaches. For example, whereas typical prior art automationsystems require barcode readers throughout the automation system as wellas mechanical mechanisms to rotate each sample tube to orient thebarcode for the reader, a single characterization station can readbarcodes on sample tubes without rotating these tubes due to themulti-angular perspective in the images. By associating the identity ofeach sample with a carrier, each carrier can convey its identity usingany suitable means including RFID or optically, via fixed orientationplanar surfaces. Furthermore, whereas typical automation systems mayutilize mechanical means for determining tube diameters, acharacterization station that optically determines diameters of samplevessels can provide a greater range of available tube diameters, withoutlimiting diameters based on physical limitations. Optical devices, suchas cameras, may be faster than mechanical sensors. By utilizing aplurality of optical devices in a single characterization station, moreexpensive optics may be available in a design budget, because sensors donot need to be replicated outside of the characterization station.

New workflows can also be utilized in some embodiments, whereby tube-topcups may be used in the automation system by allowing the system toautomatically detect the presence of these tube-top cups and determine aprecise location of the tube-top cup relative to features of thecarrier. In addition, an operator may not be required to remove all capsfrom tubes. While an uncapped tube may successfully traverse atraditional automation system, a capped tube may cause mechanicalmalfunctions if it enters a station with its cap on when the stationexpects an uncapped sample. In some embodiments, a characterizationstation may prevent mechanical failures caused by capped tubes byidentifying the issue and resolving it by sending the capped tubeautomatically to a de-capper. In some embodiments, liquid levels may bedetermined optically, allowing a low-level sample to be identifiedbefore it is processed further. For example, a sample identified ashaving insufficient fluid levels may be flagged and sent to an operatoror an automation station for placing the remaining sample fluid into atube-top cup to be further processed by the automation system.

FIG. 9B shows an alternative embodiment for optical devices that may beused in a characterization station. In this embodiment, a plurality ofmirrors or a single complex mirror 80 can be provided to allow one ormore cameras coaxially aligned with camera 67A to capture information inimages of both sides of sample vessels on the automation track. In thisexample, the front side (top of the page) of a sample tube is visible inpart of the image plane while the back and sides (bottom of the page) ofthe sample tube is visible in the image plane due to the reflections ofmirrors 80. It should be appreciated that a narrow depth of field for asingle camera may be insufficient to allow a single captured image toinclude information about the front and back side of each sample vessel.Adjustable optics for camera 67A may allow successive images to be takento reveal both the front and back side details of the sample vessel.Furthermore, two cameras placed at the location of camera 67 may allowmultiple depths of field to be used. Similarly, a single camera may beused provided it has sufficient depth of field to capture both the frontside and back side image information in a single image. These images canthen be processed via an image processor that has knowledge of thegeometry of the optics in FIG. 9B.

The sample embodiments shown in FIGS. 9A and 9B provide multi-angularviews of each sample vessel. This can allow multidimensional orientationinformation about each sample vessel to be determined. For example, bothX and Y positioning and tilt can be determined from the plurality ofperspectives. Furthermore, a barcode that exists only on a part of eachsample vessel may be viewable by at least one optical device.

FIG. 10 illustrates the effect placement within a carrier can have onthe visibility of features of sample vessels in some embodiments. Inthis example, camera 67B views carrier 55. A portion 82 (e.g., a blindspot) of the view of sample slot 84 may be obscured by a tine that holdsthe sample vessel in a slot 84. In some embodiments, the tines that holdsample vessels in carrier 55 may extend substantially up the sides ofeach sample vessel. This can allow the tines to more securely hold thesample vessel within the carrier. However, typical barcodes are placedin the form of stickers manually affixed to the walls of sample vessels.While these barcodes may extend around a substantial portion of thecircumference of each sample vessel, a tine may obscure a substantialportion of that barcode. In this example, blind spot 82 may beeliminated if the sample is moved to sample slot 86. Corresponding imageportion 85 allows a clear, visible line of sight between camera 67B anda sample in slot 86, without adjusting the angular orientation of thesample vessel. Accordingly, when a sample is placed in the carrier 55, asample handling robot arm may view and consider the position of thebarcode on a sample vessel and automatically choose a position within amultislot carrier, where the configuration of the slot and theorientation of the barcode provides an unobscured line of sight tocameras within the characterization station. This may allow the samplevessel to be placed into a carrier at load time in a manner thatfacilitates later characterization. In some embodiments, a robot arm mayalso be available to the characterization station to move a samplevessel from slot 84 to slot 86 if a portion of the barcode is obscuredby blind spot 82. In some embodiments, an operator may be instructed tochoose an orientation when manually placing a sample vessel into asample carrier so as to avoid obscuring a label. In some embodiments, asample handling station that places samples in each slot of the carriermay be configured to orient the sample vessel to provide clear line ofsight.

FIG. 11 shows another exemplary configuration of a characterizationstation. In this embodiment, cameras 67A, 67B, and 67C include depths offield 78A, 78B, and 78C respectively which are substantiallycoextensive. That is, when a sample vessel 88 is placed at theintersection of the fields of view, each imaging device can capture aclear image of some or all of the salient features of sample vessel 88.When a sample is placed in another slot, the carrier can be adjusted toplace a sample vessel at the location of sample vessel 88 to providemeaningful image information. In some embodiments, a processor coupledto cameras 67A through 67C can notice that a sample vessel is not at thelocation of sample vessel 88 and request the carrier to move that samplewithin the depths of field of the cameras.

Exemplary Automation System

Some embodiments may use systems and methods that provide a moreefficient lab automation system to allow samples to be shuttled betweenand amongst various analyzer testing stations with less latency and moreindividual control. Exemplary systems can reduce or eliminate queuesexperienced by samples traversing the automation system. Samples mayundergo many different types of testing in an analyzer, which may not beavailable in a single testing station. Testing stations within ananalyzer can be adapted for specialized testing. For example,immunoassays may be performed by an immunoassay station that includescertain incubation capabilities and uses specific reagents that areunique to immunoassays. Chemical analysis can be performed by a clinicalanalyzer and electrolyte chemistry analysis can be conducted by anion-selective electrode (ISE) clinical analyzer. By using this modularapproach, an analyzer can be adapted not only to the types of testingbeing done on samples, but also the frequency and volume of testingnecessary to accommodate the needs of the lab. If additional immunoassaycapability is needed, a lab may choose to add additional immunoassaystations and increase overall throughput for immunoassay testing intheir system.

An exemplary track geometry, for use in transporting samples within ananalyzer typical in prior art configurations, is shown in FIG. 12. Thistrack can include prior art friction tracks, which may introduceproblems in designing a track system. However, certain embodiments ofthe present invention could also use a similar geometry withoutnecessarily employing a friction track for motion. Track 100 can be agenerally oval-shaped track that conveys samples in pucks or traysbetween various stations, such as sample preparation oranalyzing/testing stations 110, 120, and 130. Track 100 could be asingle direction track or, in some instances, a linear bidirectionaltrack. In this exemplary set-up, each analyzer 110, 120, 130 is servicedby a respective sidecar 112, 122, 132. At the junction between the track100 and each sidecar, a gate or switch can be placed that allows samplesto be diverted to or from track 100 to the sidecar. The oval nature oftrack 100 can be used to circulate samples while they wait for access toeach analyzer. For example, analyzer 110 may have a full queue insidecar 112, such that new samples on track 100 cannot be diverted topullout 112 until analyzer 110 finishes handling a pending sample insidecar 112 and inserts it back into the main traffic flow of track 100.

In some systems, each sidecar can be serviced by a handling mechanismsuch as sample probe arms 114, 124, and 134. These robotic handling armscan aspirate sample material from samples in sidecar via a probe needle,or can pick up a sample tube from the sidecar and transport it into thecorresponding testing station. In this exemplary system, the availabletesting stations include an immunoassay station 110, a low-volumechemistry station 120, and an expandable dilution/ISE electrolyte andhigh-volume chemistry station (or stations) 130. Some advantages of thisapproach are that the track 100 can be part of a separate lab automationsystem that can be added onto otherwise self-contained stations, and thetrack 100 and stations 110, 120, and 130 can be independently upgraded,purchased, or serviced. Some stations, such as high-volume chemistrystation 130, can include their own friction track 136 that operatesindependently of track 100. Friction track 136 can include abidirectional friction track that allows samples to move betweensub-modules of high-volume chemistry station 130. A drawback of thistype of system may be that the separate friction tracks operateindependently and, control of overall automation becomes morecomplicated. Furthermore, transitions between friction tracks 136 and100 can be slow and cumbersome, particularly where there is no directroute between two friction tracks. In some systems, moving betweentracks may require lifting and placing samples via a robot arm. In someembodiments, each automation track can include one or morecharacterization stations to provide characterization of the locationand placement of each sample tube within each carrier, as the placementmay change if the carrier is moved between automation tracks. Inembodiments where a single track having different contiguous tracksections is used, a single characterization may be sufficient. In someembodiments, multiple characterization stations are used to provideadditional precision by increasing the number of measurements.

Some automation systems for analyzers can treat individualanalyzer/testing stations as generic destinations for a sample on thetrack. In some embodiments, the lab automation system can be integratedwithin the individual testing stations, which can substantially reduceor eliminate the complexity of the individual testing stations andreduce the need for separate sample handling systems within eachstation. In some embodiments, by integrating the lab automation systeminto the stations, the system can begin to treat individual stationsless as generic destinations and more as portions of a multi-route trackonto which a sample can travel.

FIG. 13A shows one embodiment of a track system that can be adapted foruse with the present invention. Track 150 is a rectangular/oval/circulartrack on which sample carriers move in a clockwise (or counterclockwise)direction. Track 150 may be unidirectional or bidirectional. Carrierscan transport any suitable payload with the IVD environment, such asfluid samples, reagents, or waste. Fluids, such as patient samples canbe placed in a container or vessel, such as a test tube, vial, cuvette,etc. that can be transported by a carrier. Carrier, as used herein, is ageneral term for pucks, trays, or the like for handling material inaccordance with the disclosed embodiments. Carriers, and by extensionpayloads, such as sample vessels, can move on the main track 150 or bediverted via decision points such as 164 or 166. These decision pointscan be mechanical gates or other mechanisms suitable for allowing asample to be diverted from the main track 150 to a sidecar, such as 160,160A, 160B, 160C as described herein. By way of example, if a samplecarrier is traversing the main path 150 and reaches decision point 166,it can be made to continue on the main track to segment 162 or it can bemade to divert to sidecar 160. The systems and methods by which thedecision can be made to divert the sample carrier at decision point 166are described throughout.

FIG. 13B shows an alternative track layout that may be suitable forcertain embodiments of the present invention. Track 170 is also agenerally circular track with sample carriers moving clockwise (orcounterclockwise). In this example, rather than having sidecars outsideof the track, pullouts 180, 180A, and 180B are chords within the track.Similarly, when sample carriers reach decision points, they may bediverted off the main path to a side path such as path 180. At decisionpoint 186, a sample on the main track 170 can be made to continue on themain track or be diverted onto path 180. Once an analyzer station alonghandling path 180 is done processing the sample, the sample proceeds todecision point 184 where it may be placed back onto the main path 170.

FIG. 14 shows a modular approach to the automation system track that canbe used for certain embodiments of the present invention. In thisexample, the tracks may be integrated into individual analyzer stations,such that the track can be used as part of the internal motion or samplehandling system of individual lab stations. In the prior art, it iscommon to have multiple different types of motion systems withindifferent analyzer/testing stations. For example, some stations caninclude friction tracks for shuttling pucks or trays of sample tubes,and may include carousels containing smaller vessels, such as cuvettesand reaction vessels, into which portions of the sample can be aspiratedand dispensed. In some embodiments, by integrating portions of the tracksystem into the analyzer stations themselves, each station can includeits own queuing logic and may be simplified to eliminate unnecessaryinternal motion systems. Using characterization stations and applying anoffset to carriers when positioning at various stations can provide theaccuracy and repeatability that may be useful for using an automationtrack as the primary means for positioning sample vessels within ananalyzer module.

With respect to FIG. 14, the track 200 can be broken into modularcomponents that are integrated into analyzer modules. In this exemplarytrack, modules 205, 205A, and 205B can be combined with one another andoptionally other modular track components 202 and 204 to form a tracksimilar to that shown in FIG. 13B. For instance, 205A can be a modulethat performs the same function as immunoassay 110 (FIG. 12), 205 can bea module that performs the same function as low-volume chemistry module120 (FIG. 12), and 205B can be a module that performs ISE electrolytetesting, like module 130 (FIG. 12). In this example, the main outertrack can be formed by track segments 202, 204, 206, 206A, 206B, 208,208A, and 208B. Within the analyzer modules 205, 205A, and 205B,internal paths 210, 210A, and 210B form pullouts from the main track.The internal paths can be used for internal queuing and can be managedindependently within each analyzer module to allow each module to havegreater control over samples to be processed.

One advantage of integrating track 200 and sub-paths 210, 210A, and 210Binto the analyzer modules 205, 205A, and 205B, respectively, may be thatthe internal handling mechanisms within each analyzer module can bespecially adapted to better coordinate with the track sub-paths. In someembodiments, modules 205, 205A, and 205B can be adapted to process eachsample within a period that is less than an operation cycle of theoverall analyzer, leaving enough time for the sample to be routed alongthe track system to another module after processing, allowing the othermodule to immediately process the sample on the next operation cycle. Asused herein, an operation cycle is a unit of time used by schedulingalgorithms to allot processing time to modules for sample assays. Thesecan be dynamic or fixed and can allow synchronous operation of themodules in the analyzer and provide a reliable timing model forscheduling samples amongst multiple modules in the analyzer. Theoperation cycle time can be chosen to be the time needed by any givenmodule between when it starts processing a first sample, and when it isready to process another sample under expected steady-state conditions.For example, if an analyzer can process one test every three seconds,and the expected average tests per sample is seven, the operation cycletime can be 21 seconds. It should be understood that individual modulescan implement efficiency techniques, such as parallelism or processingmultiple samples within a cycle, to maximize throughput, even when thenumber of tests-per-sample varies from an expected amount. Furthermore,it should be understood that in some embodiments, individual moduleshave different operation cycle times, and these modules can operatesubstantially asynchronously from one another. Virtual queues or bufferscan be used to assist the management of sample scheduling where cycletime or demand varies between modules.

Enabling transit between modules in the analyzer in a reliable timeframe, on the order of a single operation cycle or less, achieves manyperformance advantages not possible with prior art track systems. If asample can be reliably handled by an analyzer module and transported tothe next analyzer module within a single cycle of the analyzer, traffichandling in queuing becomes much simpler, throughput becomes moreconsistent, and latency can be controlled and reduced. Essentially, insuch an analyzer, a sample can reliably be handled by the track systemand processed uniformly such that a sample does not sit idly on thetrack system waiting in queues. Furthermore, queues within the system,such as queues within a given analyzer module, can reliably beshortened, limited by the number of modules within the system.

In some embodiments of the present invention, the reliable and rapidnature of the track system enables queues to be virtual, rather thanphysical. A virtual queue can be handled in software, rather than byphysical limitations. Traditionally, queues have been physical. Thesimplest physical queue is effectively a traffic jam at any given partof a sample handling operation. A bottleneck creates a first-infirst-out (FIFO) queue, where sample carriers are effectively stopped ina line, providing a buffer so that an analyzer or a decision point canrequest the next sample in the queue when it is ready. Most prior artlab automation tracks maintain FIFO processing queues to buffer samplesthat are waiting to be processed by the attached modules (analyzers orpre/post analytic devices). These buffers allow the track to processsample tubes at a constant rate, even though the modules or operatorrequests can create bursts of demand. FIFO queues can also substantiallyincrease the throughput of the individual modules by allowing them toperform preprocessing tasks for future samples, for example, prepare acuvette or aspirate reagent, while processing the current sample. Whilethe rigid predictability of FIFO queues enables the parallelization ofsome processing tasks, it also can prevent the modules from usingopportunistic scheduling that may increase throughput by reorderingtests on samples to optimize resources. For example, the internalresource conflicts of most immunoassay analyzers can be so complex thatthe analyzers need to interleave the tests from multiple samples inorder to reach maximum efficiency. A FIFO queue can reduce thethroughput of these analyzers by as much as 20%. Another challenge withFIFO queues is their inability to handle priority samples (e.g., a STATsample). If a STAT sample needs to be processed immediately, the entireFIFO queue has to be flushed back onto the main track, delaying allother samples on the track and forcing the original module to slowlyrebuild its queue.

Another type of queue is a random access (RA) queue. A carousel is anexample of a physical random access queue found in analyzer modules. Byaliquoting a portion of a sample into one or more vessels in a carouselring, an analyzer module can select any of a number of samples toprocess at any time within the analyzer. However, carousels may havedrawbacks, including added complexity, size, and cost. A carousel alsoincreases the steady-state processing time, because a sample must betransferred into and out of the random-access queue. Processing delaysdepend on the implementation, such as the number of positions in acarousel. On the other hand, by having random access to samples, a localscheduling mechanism within a module can process samples in parallel,performing sub-steps in any order it desires.

In some embodiments, carousels or other physical RA queues can beeliminated from the modules and the sub-paths (e.g., 210) from theautomation system can be used as part of an RA or FIFO queue. That is,if the travel time for a sample between any two points can be bound to aknown time that is similar to that of a carousel, (such as predictablyless than a portion of an operation cycle), the track 200 can be part ofthe queue for a given module. For example, rather than using a carousel,module 205 can utilize samples in carriers on sub-path 210.Preprocessing steps, such as reagent preparation, can be conducted priorto the arrival of a sample-under-test. Once that sample-under-testarrives, one or more portions of the sample can be aspirated intocuvettes or other reaction vessels for an assay. In some embodiments,these reaction vessels can be contained within module 205, off track,while in other embodiments, these reaction vessels can be placed incarriers on sub-path 210 to allow easy motion. If the sample-under-testis required to be at a module for longer than an operation cycle, or ifmultiple samples will be processed by the module during an operationcycle, the sub-path 210 can act as a queue for the module.

In some embodiments, samples not yet under test, which may be currentlylocated at other modules, can be scheduled for the next operation cycle.These next-cycle samples can be considered as residing in a virtualqueue for module 205. A module can schedule samples to arrive during agiven operation cycle for any sample on track 200. A central controller,or controllers associated with modules themselves, can resolve anyconflicts over a sample for a given cycle. By giving modules knowledgeof the arrival time of a sample, each module can prepare resources andinterleave tests or portions of tests to more efficiently allot internalresources. In this manner, modules can operate on samples in ajust-in-time manner, rather than using large physical buffers. Theeffect is that the virtual queue for a given module can be much largerthan the physical capacity of the sub-path serving that module, andexisting scheduling algorithms can be used. Effectively, each module cantreat track 200 as it would treat a sample carousel in a prior artmodule.

It should be appreciated that by employing virtual queues, multiplemodules can have multiple queues and can share a single queue or sampleswithin a queue. For example, if two modules are equipped to perform acertain assay, a sample needing that assay can be assigned to a virtualqueue for that assay, which is shared between the two modules capable ofhandling the assay. This allows load balancing between modules and canfacilitate parallelism. In embodiments where reaction vessels are placedin carriers on track 200, an assay can be started at one module (e.g.,reagents prepared and/or sample mixed in) and the assay can be completedat another (e.g., a reaction is observed at another module). Multiplemodules can effectively be thought of as a multi-core processor forhandling samples in some embodiments. In these embodiments, schedulingalgorithms for the multiple modules should be coordinated to avoidconflicts for samples during a given operation cycle.

By employing virtual queues, modules can operate on samples while thesamples are in the virtual queues of other modules. This allows lowlatency of samples, as each sample that is placed onto track 200 can beprocessed as quickly as the modules can complete the tests, withouthaving to wait through a physical queue. This can greatly reduce thenumber of sample carriers on track 200 at any given time, allowingreliable throughput. By allowing modules to share queues or samples,load balancing can also be used to maximize throughput of the system.

Another advantage of using virtual queues is that STAT samples can bedynamically assigned priority. For example, a STAT sample can be movedto the head of any queue for the next operation cycle in software,rather than having to use a physical bypass to leapfrog a STAT sample tothe head of a largely static physical queue. For example, if a module isexpecting three samples to be delivered by track 200 for assays duringthe next operation cycle, a scheduler responsible for assigning samplesto the module can simply replace one or more of the samples with theSTAT sample, and have the track 200 deliver the STAT sample forprocessing during the next operation cycle.

If decision points, such as decision points 214 and 216, can bestreamlined such that there is no need for a queue at each decisionpoint, the only physical queues can be within sub-paths 210, 210A, and210B. As described above, these can be treated as RA queues or FIFOqueues. If a STAT sample is placed onto track 200, RA queues withinsub-paths 210, 210A, and 210B need not be flushed, as the STAT samplecan be processed immediately. Any FIFO queues can be individuallyflushed. For example, if a STAT sample is placed onto track 200 atsection 222, the sample may be routed to the appropriate analyzer 205Bvia the outside track and decision point 216. If there are other samples(and by extension the sample carriers transporting those samples)waiting in the queue in path 210B, only those samples in the queue mayneed to be flushed to allow a STAT sample to take priority. If the outertrack 200 is presumed to take less than an operation cycle to traverse,any samples that were flushed from the queue in 210B can simply becirculated around the track and placed immediately back into the queuein path 210B immediately behind the STAT sample, eliminating any downtime caused by the STAT sample.

Entry paths 220 and 222 can be used to input samples to the track 200.For example, regular priority samples can be placed onto track 200 atinput 220 and STAT priority samples can be placed on input 222. Theseinputs can be used as outputs for samples when complete, or other ports(not shown) can be used as the output paths for used samples. Input 220can be implemented as an input buffer, acting as a FIFO queue for inputsamples seeking access to the track 200. Once a sample reaches the headof the queue at input 220, it can be moved onto the track (either bybeing placed in a carrier or by being placed in a carrier when it isplaced in input 220). A STAT sample can enter the track 200 immediatelyafter being placed at input 222 or, if track 200 is overcrowded, theSTAT sample can enter the track at the next available uncrowdedoperation cycle. Some embodiments monitor the number of carriers on thetrack during an operation cycle and limit the total number to amanageable amount, leaving the remainder in input queues. By restrictingsamples at the input, track 200 can be free of traffic, allowing it toalways be operated in the most efficient manner possible. In theseembodiments, the transit time of a sample between two modules can be abounded value (e.g., less than some portion of an operation cycle),allowing simplified scheduling.

In some embodiments, the track system 200 can be designed to bebidirectional. This means that sample carriers can traverse the outsidepath and/or any sub-paths in either direction. In some embodiments,additional sub-paths, such as 211B accessed via additional decisionpoints 215 and 217, can assist in providing bidirectional access.Bidirectional paths can have inherent advantages. For example, if normalpriority samples are always handled in the same direction, a STAT samplecan be handled in the opposite direction along the sub-path. This meansthat a STAT sample can essentially enter the exit of the sub-path and beimmediately placed at the head of the queue without requiring the queueto be flushed. For example, if a STAT sample is placed on track 200 atsegment 204, it can enter path 210B via decision point 214 and proceedinto path 210B to be immediately placed at the head of any queue.Meanwhile, in all of these examples, because queues are presumed to belimited generally to sub-paths, there is no need to flush queues inother modules if a STAT sample does not need immediate access to thosemodules. Any additional modules that need to service a STAT sample on asubsequent cycle can flush their queues at that point, providing“just-in-time” access to a STAT sample without otherwise disrupting theoperation of each analyzer module.

Modular design can also allow certain other advantages. If theautomation systems within an analyzer module are adapted to takeadvantage of the track system contained in the module, new features canbe added that use the common track. For example, a module could have itsown internal reagent carousel that includes all of the reagentsnecessary for performing the assays prescribed for the samples. Whenreagents stocked in the analyzer module run low, an operator canreplenish the reagents in some embodiments by simply loading additionalreagents onto the track 200. When the reagents on track 200 reach theappropriate module, the module can utilize mechanical systems such as anarm or a feeder system that takes the reagents off of the track andplaces the reagents in the reagents store for the module.

In some embodiments, the individual track portions shown in FIG. 14 andFIG. 13A and FIG. 13B can be operated independently from one another, orcan be passive. Independent carrier movement can provide advantages overfriction-based track systems (such as non-localized conveyor belts wherethe entire friction track must be moved to effect movement of a samplecarrier). This means that other samples also on that track must move atthe same rate. This also means that if certain sections operate atdifferent speeds, collisions between passive carriers carrying samplescan occur.

FIG. 15A depicts an exemplary carrier 250 for use with some embodimentsof the present invention. Carrier 250 can hold different payloads indifferent embodiments. One payload can be a sample tube/fluid container255, which contains a fluid sample 256, such as blood or urine. Otherpayloads may include racks of tubes or reagent cartridges or any othersuitable cartridge. Sample carrier 250 includes a main body 260, whichcan house the internal electronic components describe herein. The mainbody 260 supports a bracket 262, which can accept a payload. In someembodiments, this is a shallow hole that is designed to accept a fluidcontainer 255 such as a sample tube, and hold it with a friction fit. Insome embodiments, the friction fit can be made using an elastic bore ora clamp that can be fixed or energized with a spring to create a holdingforce. In some embodiments, sample racks and reagent cartridges can bedesigned to also attach to the bracket 262, allowing bracket 262 to actas a universal base for multiple payload types.

Body 260 is supported by guide portion 266, which allows the carrier 250to follow a track between decision points. Guide portion 266 caninclude, for example, a slot to accept one or more rails in the track,providing lateral and/or vertical support. In some embodiments, theguide portion allows the carrier 250 to be guided by walls in the track,such as the walls of a trough shaped track. The guide portion 266 canalso include drive mechanisms, such as friction wheels that allow amotor in the carrier body 260 to drive the carrier or puck 250 forwardor backward on the track. The guide portion 266 can include other drivecomponents suitable for use with the embodiments described throughout,such as magnets or induction coils.

Rewritable display 268 can be provided on the top of the carrier 250.This display can include an LCD oriented panel and can be updated inreal time by the carrier 250 to display status information about sample256. By providing the electronically rewritable display 268 on the topof the carrier 250, the status information can be viewed at a glance byan operator. This can allow an operator to quickly determine whichsample he/she is looking for when there are multiple carriers 250 in agroup. By placing the rewritable display 268 on top of the carrier 250,an operator can determine status information even when multiple carriers250 are in a drawer or rack.

FIG. 15B shows an exemplary track configuration 270 for use by carriers250. In this example, carriers 250A transport sample tubes, whilecarriers 250B transport racks of tubes along main track 272 and/orsubpaths 274 and 274A. Path 276 can be used by an operator to placesamples into carriers or remove samples from these carriers.

FIG. 15C shows an additional view of an exemplary track configuration270. In this example, sub-path 274 serves an immunoassay station, whilesub-path 274A serves a clinical chemistry station. Input/output lane 276can be served by a sample handler station 280 that uses sub paths 277and 278 to buffer samples for insertion or removal of the samples fromthe main track 272.

In some embodiments, the sample handler 280 can also load and unloadsamples or other payloads to/from the carriers 250A and 250B. Thisallows the number of carriers to be reduced to the amount needed tosupport payloads that are currently being used by the stations in tracksystem 270, rather than having a vast majority of carriers sitting idleon tracks 277 and 278 during peak demand for the analyzer. Instead,sample trays (without the carriers disclosed herein) can beplaced/removed by an operator at input/output lane 276. This can reducethe overall cost of the system and the number of carriers needed can bedetermined by the throughput of the analyzer, rather than based onanticipating the peak demand for the analyzer in excess of throughput.

Intelligent Carriers

In some embodiments, intelligent carriers can enable certainimprovements over passive pucks on the friction-based tracks. Forexample, one disadvantage of prior art track systems is that at eachdecision point the decision for directing a puck is made by the track byrotating the puck and reading a barcode optically. Rotating and opticalreading is a relatively slow process. Furthermore, this process can beredundant because the system has knowledge of the identification of thesample tube when the sample tube is placed into the puck by an operator.Embodiments of the present invention can include carriers that havemeans to identify the contents of the sample tube (and optionallycommunicate this information to the automation system) without requiringthe carrier to be stopped, rotated, and read optically.

For example, a carrier can include an onboard optical reader toautomatically read a barcode of a payload. The results of the scan canthen be stored in the memory of a carrier if the carrier has onboardprocessing capability. Alternatively, an outside source, such as aprocessor coupled to a hand barcode reader operated by an operator atthe time of placing the sample into the carrier, can communicate thebarcode information of the payload to the carrier via RF signal or otherknown means, such as communication protocol using temporary electricalcontact or optical communication. In some embodiments, the associationof the carrier with the payload can be stored external to the carrierand the identity of the carrier can be conveyed by the carrier to thesystem by RF, optical, or near-field communication, allowing the systemto assist in routing or tracking the carrier and the payload. Routingdecisions can then be made by the carrier or by identifying the carrier,rather than reading a unique barcode of a payload.

In some embodiments, by moving processing capability and/or sensorcapability onto each individual carrier, the carriers can participateactively and intelligently in their own routing through the tracksystem. For example, if individual carriers can move independently ofone another either by autonomous motive capabilities or by communicationwith the track, certain performance advantages can be realized.

In some embodiments, by allowing carriers to move independently,carriers can move around the track faster. One limitation on the motionof a carrier is that it should not spill an open-tube sample. Thelimiting factor is generally not the velocity of the carrier in astraight line, but the acceleration and jerk experienced by the carrier(while speeding up, slowing down, or turning), which may causesplashing. For friction-based track systems, the velocity of the trackshould be limited to prevent acceleration and jerk experienced by pucksfrom exceeding threshold amounts because the entire track moves.However, by using a track system with independently operating sectionsthat can respond to individual carriers, or individual carriers thathave autonomous motive capability, the acceleration of any given carriercan be tailored to limit acceleration/deceleration and jerk, whileallowing the average velocity to be greater than that of traditionaltracks. By not limiting the top speed of a carrier, the carrier cancontinue to accelerate on each track section as appropriate, resultingin a substantially higher average speed around the track. This canassist the carrier in traversing the entire track system in less thanone machine cycle of the analyzer. These machine cycles can be, forinstance 20 or 40 seconds.

Similarly, in some embodiments, an autonomous carrier can know its ownidentity and that of its payload. This allows the carrier to activelyparticipate or assist in the routing decision process at individualdecision points. For example, upon reaching a decision point (e.g.,switch, intersection, junction, fork, etc.), a carrier can communicateits identity and/or the identity of its payload to the track or anyswitching mechanism (or its intended route that the carrier hasdetermined based on the payload identity), via RF or near-fieldcommunication. In this scenario, the carrier does not need to be stoppedat a decision point for a barcode scan. Instead, the carrier can keepgoing, possibly without even slowing down, and the carrier can be routedin real time. Furthermore, if the carrier knows where it is going orcommunicates its identity to the track (such that the track knows wherethe carrier is going) before the carrier physically reaches a decisionpoint, the carrier can be made to decelerate prior to a decision pointif the carrier will be turning. On the other hand, if the carrier doesnot need to turn at the decision point, the carrier can continue at ahigher velocity because the sample carried by the carrier will notundergo cornering forces if the carrier is not turning at the decisionpoint or a curved section of the track.

In some embodiments, an autonomous carrier can also include onboardprocessing and sensor capabilities. This can allow a carrier todetermine where it is on the track and where it needs to go, rather thanbeing directed by the track (although in some embodiments, a centralcontroller sends routing instructions to the carrier to be carried out).For example, position encoding or markers in the track can be read by acarrier to determine the carrier's location. Absolute positioninformation can be encoded on a track surface to provide referencepoints to a carrier as it traverses the track. This position encodingcan take many forms. The track may be encoded with optical markers thatindicate the current section of the track (e.g., like virtual highwaysigns), or may further include optical encoding of the specific absolutelocation within that section of track (e.g., like virtual mile markers).Position information can also be encoded with markings between absoluteposition marks. These can provide synchronization information to assista carrier in reckoning its current trajectory. The optical encodingscheme may take on any appropriate form known to one skilled in the art.These marks used by the encoding scheme may include binary positionencoding, like that found in a rotary encoder, optical landmarks, suchas LEDs placed in the track at certain positions, barcodes, QR codes,data matrices, reflective landmarks, or the like. General positioninformation can also be conveyed to the carrier via RF/wireless means.For example, RFID markers in the track can provide near fieldcommunication to the carrier to alert the carrier that it has entered agiven part of the track. In some embodiments, local transmitters aroundor near the track can provide GPS-like positioning information to enablethe carrier to determine its location. Alternatively, sensors in thetrack, such as Hall effect sensors or cameras, can determine theposition of individual carriers and relay this information to thecarrier.

Similarly, the carrier can have sensors that indicate relative motion,which provide data that can be accumulated to determine a position. Forexample, the carrier may have gyroscopes, accelerometers, or opticalsensors that observe speckle patterns as the carrier moves to determinevelocity or acceleration, which can be used to extrapolate a relativeposition.

Because a carrier can know where it is and know its motion relative tothe track, a carrier can essentially drive itself, provided it knows itsdestination. The routing of the carrier can be provided in manydifferent ways in various embodiments. In some embodiments, when acarrier is loaded with the sample, the system can tell the carrier thedestination analyzer station. This information can be as simple as theidentification of the destination station in embodiments where thecarrier has autonomous routing capability. This information can also bedetailed information such as a routing list that identifies the specificpath of the individual track sections and decision points that a carrierwill traverse. Routing information can be conveyed to the carrier viaany communication method described herein, such as RF communication,near field/inductive communication, electrical contact communication, oroptical communication.

In an exemplary embodiment, when an operator scans the barcode of thesample tube and places it in a carrier, the system determines theidentity of the carrier and matches it with the identity of the sample.The system then locates the record for the sample to determine whichtests the sample must undergo in the analyzer. A scheduler thenallocates testing resources to the sample, including choosing whichtests will be done by individual testing stations and when the sampleshould arrive at each testing station for analysis. The system can thencommunicate this schedule (or part of the schedule) to the carrier toinform the carrier of where it needs to go, and optionally when it needsto go and/or when it needs to arrive.

In some embodiments, once the carrier is placed onto the track system,the routing capabilities and location acquisition systems of the carrierenable the carrier to determine where it is on the track and where itneeds to go on the track. As the carrier traverses the track, thecarrier reaches individual decision points and can be directed along themain track or along sub-paths as appropriate. Each carrier operatesindependently from one another, a carrier can do this quite quicklywithout necessarily stopping at each decision point and without waitingfor other carriers in a queue. Because these carriers can move quickly,there may be less traffic on the main sections of the track, whichreduces the risk of collision or traffic jams at decision points orcorners in the track (e.g., sections where carriers might slow down toavoid excessive forces on the sample).

Motive force can be provided to the carriers in many ways. In someembodiments, the track actively participates in providing individualizedmotive force to each carrier. In some embodiments, motive force isprovided by electromagnetic coils in the track that propel one or moremagnets in the carrier. An exemplary system for providing this motiveforce is the track system provided by MagneMotion, Inc., which cangenerally be understood by the description of the linear synchronousmotors (LSMs) found in U.S. Published Patent Application 2010/0236445,assigned to MagneMotion, Inc. These traditional systems utilizing thismagnetic motion system have included passive carriers that lack theintegrated intelligence of the carriers described herein, and allrouting and decisions are made by a central controller with no need foractive carriers that participate in the routing and identificationprocess.

In embodiments that utilize magnetic motion, the electromagnetic coilsand the magnets operate as an LSM to propel each individual carrier inthe direction chosen with precise control of velocity, acceleration, andjerk. Where each coil on the track (or a local set of coils) can beoperated independently, this allows highly localized motive force toindividual carriers such that individual carriers can move with theirown individually tailored accelerations and velocities. Coils local to acarrier at any given moment can be activated to provide precise controlof the direction, velocity, acceleration, and jerk of an individualcarrier that passes in the vicinity of the coils.

In some embodiments, a track may be comprised of many individuallyarticulable rollers that act as a locally customizable friction track.Because individual micro-sections of the track can be managedindependently, rollers immediately around a carrier may be controlled toprovide individualized velocity, acceleration, and jerk. In someembodiments, other active track configurations can be used that providelocalized individual motive force to each carrier. In some embodiments,tracks move with more precision near instruments.

In some embodiments, the track may be largely passive, providing afloor, walls, rails, or any other appropriate limitations on the motionof a carrier to guide the carrier along a single dimension. In theseembodiments, the motive force is provided by the carrier itself. In someembodiments, each individual carrier has one or more onboard motors thatdrive wheels to provide self-propelled friction-based motive forcebetween the track and the carrier. Unlike traditional friction tracks,where the track is a conveyor, carriers with driven wheels can traversethe track independently and accelerate/decelerate individually. Thisallows each carrier to control its velocity, acceleration, and jerk atany given moment to control the forces exerted on its payload, as wellas traverse the track along individually tailored routes. In someembodiments, permanent magnets may be provided in the track andelectromagnets in the carrier may be operated to propel the carrierforward, thereby acting as an LSM with the carrier providing the drivingmagnetic force. Other passive track configurations are alsocontemplated, such as a fluid track that allows carriers to float andmove autonomously via water jets or the like, a low friction track thatallows carriers to float on pockets of air provided by the track, (e.g.,acting like a localized air hockey table), or any other configurationthat allows individual carriers to experience individualized motiveforces as they traverse the track.

FIG. 16 shows a top level system diagram of the control systems andsensors for an intelligent autonomous carrier 300. Carrier 300 iscontrolled by a microcontroller 301 that includes sufficient processingpower to handle navigation, maintenance, motion, and sensor activitiesneeded to operate the carrier. Because the carrier is active andincludes onboard electronics, unlike prior art passive carriers, thecarrier includes an onboard power station. The details of this stationvary in different embodiments of the present invention. In someembodiments, power system 303 comprises a battery that may be charged asthe carrier operates, while in other embodiments, the battery isreplaceable or can be manually charged when the carrier is notoperating. Power system 303 can include the necessary chargingelectronics to maintain a battery. In other embodiments, the powersystem 303 comprises a capacitor that may be charged by inductive orelectrical contact mechanisms to obtain electrical potential from thetrack itself, in much the same way a subway car or model train mightreceive power.

Microcontroller 301 communicates with system memory 304. System memory304 may include data and instruction memory. Instruction memory inmemory 304 includes sufficient programs, applications, or instructionsto operate the carrier. This may include navigation procedures as wellas sensor handling applications. Data memory in memory 304 can includedata about the current position, speed, acceleration, payload contents,navigational plan, identity of the carrier or payload, or other statusinformation. By including onboard memory in carrier 300, the carrier cankeep track of its current status and uses information to intelligentlyroute around the track or convey status information to the track orother carriers.

Microcontroller 301 is responsible for operating the motion system 305,sensors 312, 313, and 314, communication system 315, status display 316,and sample sensor 317. These peripherals can be operated by themicrocontroller 301 via a bus 310. Bus 310 can be any standard bus, suchas a CAN bus, that is capable of communicating with the plurality ofperipherals, or can include individual signal paths to individualperipherals. Peripherals can utilize their own power sources or thecommon power system 303.

Motion system 305 can include the control logic necessary for operatingany of the motion systems described herein. For example, motion system305 can include motor controllers in embodiments that use driven wheels.In other embodiments, motion system 305 can include the necessary logicto communicate with any active track systems necessary to provide amotive force to the carrier 300. In these embodiments, motion system 305may be a software component executed by microcontroller 301 andutilizing communication system 315 to communicate with the track.Devices such as motors, actuators, electromagnets, and the like, thatare controlled by motion system 305 can be powered by power system 303in embodiments where these devices are onboard the carrier. Externalpower sources can also provide power in some embodiments, such asembodiments where an LSM provides motive force by energizing coils inthe track. In some embodiments, motion system 305 controls devices on oroff the carrier to provide motive force. In some embodiments, the motionsystem 305 works with other controllers, such as controllers in thetrack, to coordinate motive forces, such as by requesting nearby coilsin the track be energized or requesting the movement of local rollers.In these embodiments, motion system 305 can work together withcommunication system 315 to move the carrier.

Carrier 300 can include one or more sensors. In some embodiments,carrier 300 includes a collision detection system 312. Collisiondetection system 312 can include sensors at the front or back of acarrier for determining if it is getting close to another carrier.Exemplary collision detection sensors can include IR range-finding,magnetic sensors, microwave sensors, or optical detectors. Whereas manyprior art pucks are round, carrier 300 may be directional, having afront portion and a rear portion. By having a directional geometry,carrier 300 can include a front collision detector and a rear collisiondetector.

In some embodiments, collision detection information can includeinformation received via the communication system 315. For example, insome embodiments, the central controller for the track can observe thelocation and speed of carriers on the track and evaluate collisionconditions and send updated directions to a carrier to prevent acollision. In some embodiments, nearby carriers can communicate theirpositions in a peer-to-peer manner. This allows carriers to individuallyassess the risk of collision based on real-time position informationreceived from other carriers. It will be understood that in embodimentswhere the carrier receives trajectory information about other carriers,or decisions are made with the help of a centralized controller that hasaccess to trajectory information of nearby carriers, the carriers neednot be directional, and can include sensors or receivers that do notdepend on a given orientation of a carrier.

Carrier 300 can also include a position decoder 313. This sensor canextrapolate the carrier's position as described herein. For example,position decoder 313 can include a camera or other optical means toidentify landmarks in the track, or observe optical encoding in thetrack. In some embodiments, position decoder 313 can also includeinertial sensors, magnetic sensors, or other sensors sufficient todetermine a carrier's current position, direction, velocity,acceleration, and/or jerk.

Carrier 300 can optionally include a barcode reader 314. If equippedwith the barcode reader 314, carrier 300 can observe the barcode of itspayload at the time the samples are loaded onto the carrier or at anytime thereafter. This prevents the need for a carrier to stop atindividual decision points to have the system read the barcode of asample tube. By reading and storing the identity of the sample tube, orconveying this information to the overall system, a carrier may moreefficiently traverse the track system because routing decisions can bemade in advance of reaching a decision point. Alternatively, where asystem knows the identity of the sample when it is placed onto thecarrier, the system can include an external barcode reader and canconvey the identity of the payload to the carrier for storage and memory304 via communication system 315.

Communication system 315 can comprise any mechanisms sufficient to allowthe carrier to communicate with the overall automation system. Forexample, this can include an XBee communication system for wirelesscommunication using an off-the-shelf communication protocol, such as802.15.4, any appropriate version of 802.11, or any standard orproprietary wireless protocol. Communication system 315 can include atransceiver and antenna and logic for operating an RF communicationprotocol. In some embodiments, communication system 315 can also includenear-field communication, optical communication, or electrical contactcomponents. Information conveyed via the communications system to/fromcarrier 300 is described throughout this application.

In some embodiments, the carrier can also include a status displaymodule 316. The status display module 316 can include a controller andrewritable electronic display, such as an LCD panel or E-ink display. Insome embodiments, the controller is treated as an addressable portion ofmemory, such that the microcontroller 301 can easily update the statusdisplay 316. In some embodiments, the carrier also includes samplesensor 317. This sensor can be used to indicate the presence or absenceof a fluid container in the carrier's tube bracket. In some embodiments,this is a momentary mechanical switch that is depressed by the presenceof a tube and not depressed when a tube is absent. This information canbe used to determine the status of a tube, which can assist in thedisplay of status information by status display module 316.

Routing

In some embodiments, substantially instantaneous trajectory observationand control is conducted on-board each carrier to facilitate real-timecontrol, while the overall routing decisions are made by a centralcontroller that manages a group of carriers. Therefore, in someembodiments of the present invention, the carriers act likesemi-autonomous robots that receive global routing instructions from acentral controller, but make local motion decisions substantiallyautonomously.

For example, when a carrier receives a sample (e.g., a patient fluidsample or other payload) a central controller managing one or morecarriers determines the schedule for that carrier and instructs thecarrier where to go on the track of, for example, an in vitrodiagnostics automation system. This instruction can be a next-hopinstruction (e.g., identifying the next leg of a route), such as goingto a given decision point, moving forward to the next decision point, orturning at a given decision point. In some embodiments, the instructionscan include a complete or partial list of track segments and decisionpoints to be traversed and whether to turn at each decision point. Theseinstructions can be communicated to the carrier from a centralcontroller via any conventional means, including wireless or contactelectrical signaling, as explained throughout this disclosure.

While following the instructions, each carrier can make a determinationof the appropriate velocity, acceleration, and jerk (as used herein,acceleration includes deceleration). This can include a real-timedecision of whether the carrier must slow down to avoid collision or toenter a curve without causing excessive lateral forces, or slow downbefore the next decision point. These decisions can be made with theassistance of any onboard sensors, as well as external informationreceived by the carrier, such as information about the position andtrajectory of nearby carriers. For example, accelerometers and/or trackencoding information can be used to determine the current velocity,acceleration, and jerk, as well as the current position of a carrier.This information can be used by each carrier to determine its trajectoryand/or can be conveyed to other carriers. Collision detectors, such asRF rangefinders, can determine whether or not a potential collisioncondition exists to assist the carrier in determining whether it needsto slow down and/or stop. This collision determination can includetrajectory information about the current carrier, as well as thetrajectory information about surrounding carriers received by thecurrent carrier through observation or by receiving information from acentral scheduler for the track.

FIG. 17 shows an exemplary routing scenario in automation system 400.Carrier 430 receives routing instructions from central managementprocessor 440 via RF signaling. Central management processor 440 canparticipate in monitoring and directing carriers, including issuingrouting instructions and scheduling the movement and dispatch ofcarriers. Central management processor 440 can be part of the centralcontroller and/or local controllers that interact with individualmodules or stations. Central or local controllers can also act at thedirection of central management processor 440. Central managementprocessor 440 can include one or more processors operating together,independently, and/or in communication with one another. Centralmanagement processor 440 can be a microprocessor, software operating onone or more processors, or other conventional computer means suitablefor calculating the schedule for multiple carriers within the tracksystem 400.

Central management processor 440 can receive position information frommultiple carriers, as well as any sensor information from sensors in thetrack system 400 and/or information reported by the carriers. Centralmanagement processor 440 uses the status information of the carriers andtrack as well as the identity of samples or other payload carried by thecarriers and the required assays to be performed by the system on thesesamples.

The exemplary track 400 shown in FIG. 17 includes a first curve segmentA, that connects to straight segment B and a pullout segment G (e.g., asegment that serves a testing station), which serves analyzer/testingstation 205A and pipette 420, via decision point 402. Segment B connectsto straight segment C and a pullout segment H, which servesanalyzer/testing station 205 and pipette 422, via decision point 404.Segment C connects to curved segment D, which serves sample handlingstation 205C, and pullout segment I, which serves analyzer/testingstation 205B and pipette 424, via decision point 406. Segment D connectsto straight segment E and the other end of pullout segment I, viadecision point 408. That is, there are different paths between decisionpoints 406 and 408—segments D and I, (where segment I is a pullout thatcan be used to deliver samples to interact with pipette 424). Segment Econnects to straight segment F and the other end of pullout segment H,via decision point 410. Segment F connects to curved segment A and theother end of pullout segment G, via decision point 412. In someembodiments, track 400 includes input and output lanes J and K, whichcan be used to add or remove carriers at decision points 402 and 412.

In some embodiments, decision points 402-412 are passive forks in thetrack that carrier 430 can navigate to select a proper destinationsegment. In other embodiments, decision points 402-412 are active forksthat can be controlled by carrier 430 or central management processor440. In some embodiments, decision points 402-412 areelectromagnetically controlled switches that respond to requests bycarrier 430, such as via RF or near-field communication. In someembodiments these electromagnetically controlled switches have a defaultposition, such as straight, that the switch will return to once acarrier has been routed. By using default positions for decision points,a carrier may not need to request a position at each decision point,unless it needs to be switched at that decision point.

Scheduler central management processor 440 assigns carrier 430 a firstroute, Route 1, to place the carrier 430 and its payload within reach ofpipette 420. Carrier 430 is instructed to travel along segment J todecision point 402 and travel onto segment G to stop at a positionaccessible to pipette 420. In some embodiments, carrier 430 receives theinstructions and determines its current location and trajectory todetermine a direction and trajectory to use to reach decision point 402.Carrier 430 can also take into account that it will be making a hardright turn at decision point 402 onto segment G. In some embodiments,decision point 402 includes a switching mechanism in the track that canoperate under the control of carrier 430. In these embodiments, carrier430 communicates with the track on approach to decision point 402 torequest switching onto segment G. In other embodiments, carrier 430 mayhave a steering mechanism (such as moveable guide wheel, directionalmagnets, asymmetric brakes, or the like) that allows carrier 430 to makea right turn onto segment G at decision point 402, without theassistance of an external gate integrated into the track. In theseembodiments, carrier 430 engages the steering mechanism at decisionpoint 402 to make the turn onto segment G.

Carrier 430 can determine its rough location—its current track section,such as section J, by reading encoding in the track, such as opticalencoding, or RFID tags. In some embodiments, carrier 430 uses multiplemeans to determine its location within the track system 400. Forexample, RFID tags can be used to determine generally on which tracksegment the carrier 430 is located, while optical encoding or otherprecise encoding can be used to determine the position within that tracksegment. This encoding can also be used to determine velocity,acceleration, or jerk by observing changes in the encoding (e.g.,derivatives from the position information).

Carrier 430 can use the identification of the current track section todetermine the appropriate route to the destination section either byexplicit instruction received by the central management processor 440 orby looking up an appropriate route in an onboard database in memory 304,as shown in the onboard control systems in FIG. 12. In some embodiments,the carrier 430 has an understanding of how to reach section G fromsection J based on a map stored in the memory of carrier 430 in memory304. This map can include a simple lookup table or a tree of tracksections where each node is linked by the corresponding decision points,or vice versa. For example, upon identifying that the carrier iscurrently in the track section J, the onboard database can informcarrier 430 to proceed to decision point 402 to be switched to the rightonto section G.

Central management processor 440 can instruct carriers to stop atpositions to interact with pipette 420, 422, or 424. By utilizing acharacterization station to characterize offsets between the position ofsample tubes carried by a carrier and some known position on thecarrier, such as the location on a carrier that would ordinarily come torest at a fixed stopping position to interact with each of thesepipettes, central management processor 440 can instruct carriers orlocal track resources interacting with the carriers to stop the carrierat a position that compensates for any measured offset. This can allowpipettes 420, 422, or 424 to repeatably interact with sample tubes atfixed locations on the respective track sections, even though carrierstransporting the sample tubes may come to rest at locations that varyfrom carrier to carrier.

In some embodiments, carriers can utilize local track encoding aroundthe pipettes to assist in accurately placing the carrier at a stoppingposition that compensates for measured offsets. Encoding can includeoptical marks or the like and localized encoding may assist inpositioning the carrier at a desired position that is incrementallyspaced from an optical mark. In some embodiments, magnetic positioningmay be used whereby Hall effect sensors can accurately measure thecurrent location of the carrier and electromagnets can be used tomaneuver carrier to a final resting position with fine precision. Insome embodiments, the incremental distances that may be used to positiona carrier relative to a fixed stopping point may be less than 1 mm.Suitable encoding schemes that may be used for encoding positioninformation, as well as offsets from known positions, may include thoseencoding schemes described in U.S. Provisional Patent Application No.61/651,296, filed May 24, 2012, which is incorporated herein byreference in its entirety.

In some embodiments, local track sections behave differently from maintrack sections, allowing finer precision when placing carriers atlocations to interact with instruments. For example, main track sectionmay be capable of positioning a carrier with large resolution, such asseveral inches, whereas a local track section may include finerprecision components that allow a carrier to be positioned withinfractions of a millimeter.

Utilizing a Characterization Station with an Automation System

FIG. 18 shows an exemplary method for utilizing a characterizationstation to determine certain characteristics of carriers or samplevessels. At step 456, an operator or sample handling unit places asample into a carrier on an automation track. At step 457, the carrieris moved along the automation track through motive force provided by thecarrier or the automation track to a characterization station. Aftermoving, the carrier and payload may be positioned at an imaging locationwhere one or more imaging devices in a characterization station maycapture one or more images of a carrier and/or payload. In someembodiments, the carrier may be stopped at the imaging location prior toimages being taken. In some embodiments, images may be taken while acarrier is moving. It should therefore be appreciated that in someembodiments, the following steps occur after the carrier has stopped atan imaging location or while the carrier is moving through the imagelocation, depending on the embodiment.

At step 459, the characterization station captures a plurality of imagesusing a plurality of optical devices. These images capture features ofsample vessels or carriers in their field of view. At step 461, aprocessor receives these images. These images are received from theplurality of optical devices from the characterization station. In someembodiments, the processor is part of the characterization station,while in other embodiments, the processor may be external to thecharacterization station. These images can include a plurality ofperspectives of each sample vessel or carrier on the automation track.

At step 463, the processor begins performing a number of automaticanalysis steps. At step 463, the processor determines the identity ofthe carrier. At step 465, the processor determines and identity of thesample. This can occur by determining which features in the plurality ofimages corresponds to barcode information or other digital marks. Whenthese marks are read, an identity of the sample vessel, such as relatedpatient information, can be retrieved. Steps 463 and 465 can beperformed alone, alternatively, or in combination. For example, a datarecord that associates a carrier identity to its payload can be used toidentify the sample/payload once image processing reveals the identityof the carrier at step 463, or vice versa if the image reveals identityinformation about the identity of sample at step 465. At step 466, theprocessor determines the orientation of the sample vessel. Thisorientation can include XYZ translation or position or tilt information.At step 467, the processor determines if there is insufficientinformation in the images received, such as the sample vessel or carrieris out of view or out of focus. If so, the processor sends a signal toone or more processors that control the carrier or automation track tomove the carrier into a suitable position, allowing step 459 to repeatto capture a plurality of images of the shifted sample and carrier.

At step 468, the processor automatically determines the type of samplevessel or dimensions. By identifying salient features, such as edges, inthe images, the processor may determine the size characteristics of thesample vessel. Optionally, at step 469, the processor may compare theobserved dimensions of a sample vessel to a list of available tube typesand their dimensions. The processor may match the dimensions observed tothe most likely candidate sample tube type based on dimensions. In someembodiments, the dimensions of the sample tube type may be substitutedfor the observed dimensions to allow for some error in the image.

At step 470, the processor analyzes the images to determine if a cap ortube-top cup is placed on the sample vessel. If a cap is placed on thevessel, characteristics of the cap, such as the pattern or color of thecap may be used to identify certain information about the contents ofthe sample vessel, such as fluid type. This information can later beused to determine subsequent handling steps for the sample vessel. Atstep 472, the processor continues the automatic steps and identifies aliquid level in the images. This may occur by observing a meniscus edgein the image, or by observing color changes or saturation changes invarious areas of the image area at step 473, the processor automaticallyassociates the characteristics determined in steps 463 through 472 withthe sample vessel or carrier. This association may be made in a databasethat is accessible to other processors within the automation system. Forexample, a database may be shared amongst various stations in anautomation system, allowing an identification of the carrier at eachstation to be used to identify the various characteristics of thecarrier and sample vessel that were determined by the characterizationstation. This information may be useful, for example, for preciselypositioning the center of a sample vessel within a handling stationbased on orientation information determined at step 466.

At step 475, the automation system moves the carrier to the next stationin the automation system. For example, the carrier may be moved to ade-capper station if a cap is observed in step 470. Similarly, if no capis observed in step 470, the sample may be moved to a testing stationbased on the identity of the sample determined at step 465.

In some embodiments, a station within the automation system may requireaccurate placement of a sample vessel. At step 476, an offset can beapplied to the positioning of a carrier based on the orientationinformation determined at step 466. This may allow, for example, apipette to have a line of action substantially near the center of asample tube based on the characterization by the characterizationstation.

At step 477, the processing task by each station is performed on thecarrier and or sample vessel. Steps 475 through 477 are repeated, atstep 478 for all scheduled processing. This can include moving a sampleto each station within an analyzer to perform an entire test panel, asdefined by information in a laboratory information system database thatis associated with the identity of the sample determined at step 465. Atstep 470, automation is complete, and the sample is moved to a samplehandler station to be removed from the automation system and placed intostorage.

FIG. 19 shows an exemplary illustrative track 500 that includes acharacterization station 502 and a sample processing station 504. Itshould be appreciated, that in most embodiments, a plurality of sampleprocessing stations may be used, allowing samples to interact withmultiple stations to perform various tests. In this illustrativeembodiment, characterization station 502 is served by sidecar 506, whichallows samples to enter the characterization station from the maintrack, rather than proceeding on track 508. Processing station 504 isserviced by sidecar 510. Characterization station 502 can characterizethe geometry of each carrier and or the geometry of samples relative topositions in the carrier. Once a carrier is characterized, the carriercan proceed to processing station 504 where pipette 512 can access asample transported by carrier. For example, carrier 514 may becharacterized by characterization station 502 to determine an offset inthe normal stopping position for the carrier when the carrier 514 visitsprocessing station 504. Once an offset is determined, carrier 514 canstop a predetermined distance from a stopping position, such as anoptical mark, Hall effect sensor, or magnet, which will allow the centerof a sample tube transported by carrier 514 to come to rest at a nominalstopping position for interaction with pipette 512.

FIG. 20 shows the exemplary process flow 540 for use with someembodiments. In some embodiments, the stations that interact withsamples can be calibrated during a preliminary step. This can includeusing a maintenance carrier or reference device to determine if thealignments between the track and components of an instrument are atnominal positions or if an offset should be considered when interactingwith these instruments. For example, a pipette in a sample processingstation may be ideally aligned with position “0” on the local tracksection, but due to manufacturing tolerances, installation problems,wear, etc., the line of action for the pipette tip may be at a position2 millimeters from nominal. This information can be considered whensamples are handled by the pipette. For example, a carrier with nominalpositioning may apply an offset of 2 mm to align the center of a samplewith the line of action of the pipette.

Similarly, the calibration station itself may need to be calibrated.This can include an optical calibration whereby cameras are aligned withreference images to ensure that the calibration of each carriercorresponds with real-world offsets that should be applied to thecarriers. For example, a tightly toleranced carrier can be provided as areference carrier that can be calibrated to include known distancesbetween a reference sample tube and a reference position on the carrier.A characterization station may attempt to characterize the referencecarrier. Any errors found in the characterization of the referencecarrier can be zeroed out by adjusting the interpretation of images bythe calibration station. This can ensure that subsequent carriers thatmay be manufactured with lesser tolerances can be properly characterizedby the characterization station.

In some embodiments, the calibration steps may utilize maintenancecarriers, which may be manually or automatically deployed on anautomation track. Suitable maintenance carriers and deploymentmechanisms may include those disclosed in U.S. Provisional PatentApplication No. 61/712,664, filed Oct. 11, 2012, and U.S. ProvisionalPatent Application No. 61/712,694, filed Oct. 11, 2012, which areincorporated herein by reference in their entirety.

At step 542, one or more characterization stations in an automationsystem can be calibrated to ensure accurate characterization of samplesand carriers during runtime operation of the automation system.Similarly, at step 544 processing stations may be calibrated such thatthe line of action of any devices interacting with the automation trackcan be characterized and accounted for during runtime operation. In someembodiments, multiple characterization stations may be calibrated andused during runtime operations to provide further precision incharacterizing samples relative to carrier positions.

In some embodiments, multiple calibration steps may occur for othercomponents of the system, such as the automation track and anycomponents that provide motive forces for carriers. In some embodiments,calibration steps 542 and 544 may be repeated at regular intervals, suchas daily or the beginning of each shift. In some embodiments,calibration steps are only performed during initial installation of ananalyzer automation system or on-demand.

Calibration steps 546 and 548 may be performed on each carrier that willuse the automation system. These steps may be performed at regularintervals or upon request. Calibration step 546 may allow each carrierto be characterized while holding a reference sample. This may alloweach carrier to provide a baseline for the expected position of vesselsduring runtime. This calibration step can be performed by characterizingeach carrier and subsequently interacting with the carrier at processingstations to verify that a line of action of an instrument, such as apipette, coincides with the center of a reference sample vessel. At step548, a reference offset is determined from this calibration step. Thereference offset is the baseline offset that will be assumed for samplescarried by the carrier at runtime. It should be appreciated, that thereference offset may refer to a single edge of a tube or the centerpoint of a tube, which may vary depending on tube size. Accordingly, aplurality of reference offsets may be calculated for each carrier forvarious standard tube-sizes that can be transported.

Determination step 548 may be carried out automatically using aprocessor that interacts with the automation system. This processor maybe used during runtime to determine offsets and to direct carriers tospecific stopping locations for interaction with instruments. Thisprocessor may also receive information from calibration steps 542 and544. In some embodiments, the processor participates in the calibrationsteps 542 through 546.

In some embodiments, steps 546 and 542 are optional. In someembodiments, each time a tube is placed in a carrier the tube andcarrier combination is characterized. In some embodiments, thischaracterization may utilize the reference offset from step 548 tocompare the tube placement to the nominal tube placement determined atstep 548. In other embodiments, reference offsets for each carrier arenot used and each carrier vessel combination is characterized withoutany prior knowledge of the expected location of the vessel beingcarried.

At step 550, after a carrier receives a vessel, such as a sample tube,the carrier and vessel combination is characterized by at least onecharacterization station. This characterization station may be placed inany suitable position along the automation system, such as at a samplehandling station where the tube is first placed into the carrier. Insome embodiments, measurement/characterization step 550 can occurmultiple times at multiple calibration stations. In some embodiments,calibration stations may be provided for each module within theautomation system, allowing each module to make an independentdetermination of the proper offset to use when handling the carrier andvessel on local automation tracks. In some embodiments, step 550 occursimmediately before the carrier is placed in position to interact with aninstrument, such as a pipette. This may allow the most up-to-date offsetto be used.

Measurement/characterization step 550 can include optically observingthe carrier and sample vessel. Observation can include opticalmeasurement of distances and relative locations of components of acarrier and the vessel being transported. This can include using anelectro-optical device, such as a camera, a laser and photo detector, IRrangefinders, projectors, lenses, etc. In some embodiments,measurement/characterization step 550 can include mechanicalmeasurements, such as feelers that determine where a carrier has stoppedand where a vessel being transported has stopped in a characterizationstation. In some embodiments, magnetic devices, such as Hall effectsensors may be used to determine a precise location of a surface of acarrier to provide a reference position when measuring the location of asample vessel carried by the carrier.

The observation in step 550 can include determining one or moredistances between points in the carrier, such as a reference point onthe carrier and the leading and trailing edge of the sample vessel. Thiscan be used to provide a reference location of the edge or center of thevessel relative to the reference point on the carrier. By subsequentlypositioning the carrier and the reference point, the edge or center ofthe vessel can also be precisely placed. In some embodiments,measurement 550 includes detected location of an edge or center of thesample vessel in an image. This location can then be compared to theexpected location of the vessel.

The observations from step 552 can be communicated to a processor. Thismay include local signaling with a local processor or communicatingacross a network to a processor for calculation of an offset to accountfor the observed positioning of the sample vessel.

Once the carrier and vessel combination has been measured, at step 552,a processor can determine an offset from a nominal position, or anyreference point in the carrier. For example, where a carrier has beencalibrated at steps 546 and 548, the carrier may include a nominalposition, which is the expected position of the centerline of a sampletube being carried. The measurement received from step 550 may show adifference between the detected centerline of a sample vessel and thenominal centerline of the sample vessel. This can be added to any offsetdetermined by step 548. In some embodiments, an offset is calculated bydetermining the centerline of a sample tube from step 550 relative to areference point on the carrier. The offset may be the distance betweencenterline of the sample tube and the reference point on the carrier.Subsequently, when the carrier is placed for interaction with a pipette,the reference point on the carrier can be placed at a distance equal tothe offset from the centerline of the center of the tube, so that thecenter of the sample tube and the line of action of the pipette areroughly coincident. Steps 550 and 552 can occur automatically for eachsample placed on an automation system.

At step 554, the carrier is moved from the characterization station to aposition to interact with one or more processing stations within theautomation system. For example, this can include a station thataspirates a portion of a sample contained in a sample vessel for use inany number of suitable tests. Once a carrier is moved to the processingstation, the carrier can be precisely positioned such that the center ofthe vessel it transports is coincident with the line of action of anyinstrument, such as pipettes. This can be accomplished by adjusting thereference position of the carrier by the offset calculated at step 552.Step 556 may be carried out at the direction of the processor thatcalculates the offset at step 552 or may be carried out by anotherprocessor that operates responsive to the offset received from aprocessor calculating the offset at step 552. The adjustment at step 556can also take any calibration information derived from step 544 intoaccount. For example, the calibration of processing station may identifythe nominal position for a sample when interacting with pipette. Thismay be considered when calculating the final position of the carrier toalign the line of action of the pipette with the centerline of thevessel being carried.

FIG. 21 depicts the system architecture for an exemplary system for usewith some embodiments. Automation system 560 includes a processor 561that directs the activities of the automation system. Processor 561 caninteract with components of automation system 560 via network 562 orthrough direct connections. Network 562 can include a wireless orEthernet-based network. Processor 561 can interact with optical devices564, which operate as part of characterization station 566 tocharacterize carriers. In some embodiments, processor 561 can alsocommunicate directly with carriers, such as carrier 576. This can allowprocessor 561 to issue routing instructions where carriers areconfigured to operate semi-autonomously and route through the automationsystem.

Carriers can traverse automation system 560 using track 567. Once acarrier is characterized by characterization station 566, themeasurements taken by optical measuring device 564 can be communicatedto processor 561. Processor 561 can then calculate an offset to apply toeach carrier at each station 578 and 580 in the automation system. Insome embodiments, processor 561 can also communicate with and controllocal track positioning devices, such as local tracks 568 and 570. Thesecan include friction or magnetic tracks that can be operated with fineprecision to precisely position carriers, such as carrier 576, atpositions on the local automation track. For example, carrier 576 may bepositioned at an offset from reference position 572 on track 568.Reference position 572 may be a nominal position for station 578 (or aposition that should coincide with a reference position on a carrierunder nominal conditions). Carrier 576 may be positioned such that areference position within carrier 576 is placed at an offset fromposition 572 in accordance with the offset determined by processor 561,such that the center of a sample vessel being carried by carrier 576aligns with the line of action of a pipette at station 578. Similarly,station 580 may have a reference position 574 which may be used forapplying an offset to carriers interacting with pipettes in station 580.

In various embodiments, different characteristics of sample tubes andcarriers can be detected or measured by the characterization stationincluding, but not limited to, any number of the followingcharacteristics, which may be physical attributes. The characteristicscan generally be determined by analysis of one or more images capturedby one or more cameras of the characterization station:

-   -   determining which, if any, slots in a carrier are occupied by a        sample vessel;    -   an orientation of a sample vessel relative to each carrier,        which may indicate that a sample tube is leaning;    -   a linear offset or rotational offset relative to a nominal        position of a sample vessel;    -   one or more physical dimensions of at least one sample vessel        carried by each carrier;    -   an inner diameter or positional extents of the sample void of a        sample vessel, which may be useful in determining where to        locate a pipette when subsequently interacting with the sample        vessel;    -   an identification of a type of sample vessel carried by each        carrier;    -   an identification of a type of each carrier;    -   an identification of the shape of the bottom of a sample vessel        carried by each carrier;    -   a determination of whether a sample vessel carried by each        carrier is properly seated;    -   a temperature of a sample vessel carried by each carrier, which        may be determined via an infrared optical device (this may be        useful in improving reliability of tests or handling devices);    -   a fluid level or fluid volume of a fluid contained in a sample        vessel carried by each carrier (which may be qualitative, such        as determining if sufficient levels exist for testing, or        quantitative, such as determining an actual volume or number of        tests that can be performed, the resolution of which may be        improved with better images or better models of sample vessels);    -   a determination of the presence of at least one of the following        within a blood sample carried by at least one carrier: a gel        barrier, clotting, hemolysis, icterus, and lipemia (this may be        determined by observing anomalies in images, such as        discolorations and inconsistent contrast within a sample);    -   an identification of whether a cap is placed on a sample vessel        carried by each carrier;    -   an identification of at least one of a color and a type of the        cap;    -   an identification of whether a tube-top cup is placed on a        sample vessel carried by each carrier;    -   an identification of a type of the tube-top cup;    -   barcode information encoded on at least one of a sample vessel        carried by each carrier (which may be determined via a laser        barcode scanner or via optical analysis of image);    -   barcode information encoded on each carrier (which may be        determined via a laser barcode scanner or via optical analysis        of image);    -   detecting bubbles or foam on top of a sample, which may indicate        sample mishandling;    -   sample fluid color, which may be useful in confirming that the        sample is likely what it purports to be or if the sample may be        erroneous or compromised;    -   detection of peeling or misapplied barcode labels, which may be        observable if the barcode fails to lay flat against the sample        vessel or carrier surface (this may prevent sticky labels from        interfering with other components in the analyzer);    -   detection of the presence of condensation on the sides of a        sample vessels, which may appear as droplets or fogging on the        inside of the vessel;    -   detection of the type of material of the sample vessel, which        may be determined to the extent that a material, such as some        plastics respond differently to polarized light or fluoresce        under UV light;    -   detection of damage to the vessel, such as visible chips and        cracks in the vessel;    -   detecting wear to barcodes labels or other data marks (these may        have redundant information, allowing robust reading, but optical        analysis or reading of false bits can indicate that the        redundancy is being compromised);    -   detecting fluid spills on carrier surfaces, which may appear as        shiny or discolored portions on the surface;    -   detecting wear or damage to support tines or springs that hold a        sample vessel in a carrier (this may be determined by observing        that tines are out of expected alignment or that tubes        consistently rest anomalously close to or far from a support        tine, which may indicate wear to at least one spring and        demonstrate that future vessels will not be centered or will be        loosely held, and allow replacement before a problem occurs);        and    -   detecting debris in tube carrier slots when a carrier is empty        (debris can be observed in images of the tube slot when a sample        vessel is not present or determined by consistently finding        samples are nor seated properly when images of a carrier        containing a vessel are analyzed).

Although the invention has been described with reference to exemplaryembodiments, it is not limited thereto. Those skilled in the art willappreciate that numerous changes and modifications may be made to thepreferred embodiments of the invention and that such changes andmodifications may be made without departing from the true spirit of theinvention. It is therefore intended that the appended claims beconstrued to cover all such equivalent variations that fall within thetrue spirit and scope of the invention.

We claim:
 1. A characterization station configured for use with anautomation system comprising: a plurality of optical devices configuredto capture one or more images of a carrier on an automation track; and aprocessor configured to analyze the one or more images to determine atleast one physical attribute of the carrier or an object beingtransported by the carrier.
 2. The characterization station of claim 1,wherein the processor is configured to determine which, if any, of aplurality of slots in each carrier is occupied.
 3. The characterizationstation of claim 1, wherein the at least one physical attributecomprises an orientation of the object relative to the carrier.
 4. Thecharacterization station of claim 3, wherein the orientation comprisesat least one of a linear offset or rotational offset relative to anominal position.
 5. The characterization station of claim 1, whereinthe at least one physical attribute comprises physical dimensions of theobject being transported by the carrier.
 6. The characterization stationof claim 1, wherein the at least one physical attribute comprises anidentification of a type of sample vessel carried by the carrier.
 7. Thecharacterization station of claim 1, wherein the at least one physicalattribute comprises an identification of a type of each carrier.
 8. Thecharacterization station of claim 1, wherein the at least one physicalattribute comprises an identification of the shape of the bottom of asample vessel carried by each carrier.
 9. The characterization stationof claim 1, wherein the at least one physical attribute comprises adetermination of whether a sample vessel carried by each carrier isproperly seated.
 10. The characterization station of claim 1, whereinthe at least one physical attribute comprises a temperature of a samplevessel carried by each carrier.
 11. The characterization station ofclaim 1, wherein the at least one physical attribute comprises at leastone of a fluid level or fluid volume of a fluid contained in a samplevessel carried by each carrier.
 12. The characterization station ofclaim 1, wherein the at least one physical attribute comprises adetermination of the presence of at least one of the following within ablood sample carried by at least one carrier: a gel barrier, clotting,hemolysis, icterus, and lipemia.
 13. The characterization station ofclaim 1, wherein the at least one physical attribute comprises anidentification of whether a cap is placed on a sample vessel carried bythe carrier.
 14. The characterization station of claim 13, wherein theat least one physical attribute comprises an identification of at leastone of a color and a type of the cap.
 15. The characterization stationof claim 1, wherein the at least one physical attribute comprises anidentification whether a tube-top cup is placed on a sample vesselcarried by the carrier.
 16. The characterization station of claim 15,wherein the at least one physical attribute comprises an identificationof a type of the tube-top cup.
 17. The characterization station of claim1, wherein the processor is further configured to analyze the one ormore images to read barcode information encoded on the carrier or theobject being transported by the carrier.
 18. The characterizationstation of claim 1, wherein the plurality of optical devices includes aplurality of cameras placed at different positions relative to animaging location of the carrier.
 19. The characterization station ofclaim 1, wherein the plurality of optical devices includes at least onecamera and one or more mirrors placed in an image plane of the at leastone camera to provide different perspectives of the carrier.
 20. Thecharacterization station of claim 1, wherein each of the plurality ofoptical devices comprises optics with depths of field substantiallyconcurrent with an expected position of features of the carrier.
 21. Thecharacterization station of claim 1, wherein the plurality of opticaldevices comprise at least one camera configured to view the carrierhorizontally and at least one camera configured to view the carrier fromabove.